| Regional Level Types | |
|---|---|
| Rollstone Hill Quarries | Quarry (Abandoned) |
| Fitchburg | City |
| Worcester County | County |
| Massachusetts | State |
| USA | Country |



| Place | Population | Distance |
|---|---|---|
| Fitchburg | 40,545(2017) | 0.7km |
| Lunenburg | 1,760(2017) | 7.1km |
| Leominster | 41,569(2017) | 7.2km |
| Westminster | 7,028(2017) | 9.1km |
| Ashburnham | 5,643(2017) | 10.3km |
| Club | Location | Distance |
|---|---|---|
| Nashoba Valley Mineralogical Society | Westford, Massachusetts | 30km |
| Worcester Mineral Club | Worcester, Massachusetts | 35km |
| ⓘAlbite Formula:Na(AlSi3O8) Habit: Small crystals occur in the titanite pegmatites and in calcite veins (Hitchen, 1935). References: |
| ⓘAlbite var. Oligoclase Formula:(Na,Ca)[Al(Si,Al)Si2O8] Habit: "Primary oligoclase occurs along with microcline as phenocrysts in the Type II [tourmaline type] pegmatites. (Hitchen, 1935) References: |
| ⓘAllanite-(Ce) Formula:(CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) Habit: crystal habit similar to epidote, with e(101) prominent (Hitchen, 1935) Colour: dark green to black, sometimes weathered superficially to red-brown Fluorescence: none Description: Crystals to at least 30mm. References: |
| ⓘAlmandine Formula:Fe2+3Al2(SiO4)3 Habit: "Trapezohedron n(211) and the dodechedron d(110)in combination, the former being usually dominant" (Hitchen, 1935) Colour: red, orange-red, orange, pink Description: According to Hitchen (1935), the garnets on Rollstone Hill are "spessartitic almandite." He gave an analysis of 52.29% almandine, 41.53 % spessartine, 0.92 % pyrope, and 3.55% andradite. The results of an SEM-EDS analysis by Kerry Day 2008 for a garnet specimen collected by Peter Cristofono showed approximately ~ 55% almandine, 45% spessartine. |
| ⓘ'Almandine-Spessartine Series' |
| ⓘArsenopyrite Formula:FeAsS Habit: massive and in crystals (see comments) Colour: gray Description: Crystals commonly show the forms m(110), q(011), e(101), k(021), t(013). "Certain crystals ...recently acquired by the Harvard Museum, are somewhat complex and show, in addition to the above, the forms: g(111), o(112), i(312), n(012), Φ(023), τ(031), x(321), B(514)." (Hitchen, 1935) |
| ⓘBeryl Formula:Be3Al2(Si6O18) Habit: Individual crystals measure from 0.3 to 2 cms, in diameter (Hitchen, 1935) Colour: golden yellow, pale green, aquamarine References: |
| ⓘBeryl var. Aquamarine Formula:Be3Al2Si6O18 |
| ⓘBeryl var. Goshenite Formula:Be3Al2(Si6O18) References: |
| ⓘBeryl var. Heliodor Formula:Be3Al2(Si6O18) Description: "At the quarries at Fitchburg, beryl of a rich golden hue, approaching the chrysoberyl and topaz in color and hardness, and closely resembling the yellow diamond in lustre, have been blasted out." -- Hamlin, A. C. (1870): The Gems of the United States inProceedings of the American Association for the Advancement of Science, Eighteenth Meeting, p. 212. |
| ⓘ'Biotite' Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 Habit: usually not well crystallized Colour: black Description: "The refractive indices are: α =1.640 β and γ = 1.645, and suggest siderophyllite." (Hitchen, 1935) References: |
| ⓘCalcite Formula:CaCO3 Habit: massive Colour: white Description: Rare calcite veins occur in the granite. |
| ⓘChalcopyrite Formula:CuFeS2 Habit: grains of chalcopyrite are frequently grown upon pyrrhotite (Hitchen, 1935) Colour: brassy References: |
| ⓘChamosite Formula:(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8 Colour: dark green Description: Occurs as an alteration of biotite. |
| ⓘ'Columbite-(Fe)-Columbite-(Mn) Series' ? Description: Probably misidentified; likely ilmenite. References: |
| ⓘEpidote Formula:(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) Habit: as accessory grains in granite |
| ⓘ'Feldspar Group' References: |
| ⓘ'Feldspar Group var. Perthite' References: |
| ⓘFluorapatite Formula:Ca5(PO4)3F Habit: hexagonal prisms Colour: gray Fluorescence: yellow (SW) |
| ⓘFluorite Formula:CaF2 Habit: "Small light purple to colourless cubes, 0.3 cm along an edge, occur on the selvages of the calcite veins (Hitchen, 1935). Colour: colorless, purple References: |
| ⓘ'Gummite' ? Description: Reported as an alteration product of allanite by Emerson (1917). |
| ⓘIlmenite Formula:Fe2+TiO3 Habit: as large platy crystals in quartz, and delicate hexagonal plates in calcite (Hitchen, 1935) Colour: black References: |
| ⓘMarcasite Formula:FeS2 Description: Noted as concretionary masses resulting from supergene alteration of pyrrhotite (Hitchen, 1935). References: |
| ⓘMicrocline Formula:K(AlSi3O8) Habit: Good crystals occur in quartz. Colour: white References: |
| ⓘMolybdenite Formula:MoS2 Description: Found only in the beryl pegmatite (Hitchen, 1935). References: |
| ⓘMuscovite Formula:KAl2(AlSi3O10)(OH)2 Habit: Good crystals occur in the calcite veins. According to Hitchen (1935), pinkish bronze plates to 4 cm occurred in the beryl pegmatite. Colour: gray, bronze Fluorescence: none References: |
| ⓘMuscovite var. Sericite Formula:KAl2(AlSi3O10)(OH)2 References: |
| ⓘOpal Formula:SiO2 · nH2O Habit: amorphous coating Colour: cololress Fluorescence: green |
| ⓘOpal var. Opal-AN Formula:SiO2 · nH2O Habit: amorphous coating Colour: cololress Fluorescence: green |
| ⓘPyrite Formula:FeS2 Description: Pyrite is very rare. Arsenopyrite is the most common sulfide at Rollstone Hill, followed by pyrrhotite. References: |
| ⓘPyrrhotite Formula:Fe1-xS Description: Associated with chalcopyrite. References: |
| ⓘQuartz Formula:SiO2 Habit: almost always massive Colour: colorless, smoky |
| ⓘQuartz var. Smoky Quartz Formula:SiO2 Habit: massive Colour: smoky |
| ⓘRutile Formula:TiO2 Habit: microscopic rutile needles in quartz occurs in the granite (Hitchen, 1935) |
| ✪Schorl Formula:NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) Habit: Crystals to 10 cm long. (Hitchen, 1935) Colour: black Fluorescence: none References: |
| ⓘSiderophyllite ? Formula:KFe2+2Al(Al2Si2O10)(OH)2 Colour: black Description: "The refractive indices are: α =1.640 β and γ = 1.645, and suggest siderophyllite." (Hitchen, 1935) References: |
| ⓘTitanite Formula:CaTi(SiO4)O Habit: simple, tabular crystals to 2 cm (Hitchen, 1935) Colour: brown, cinnamon brown |
| ⓘUraninite Formula:UO2 Description: Lane (1933) gives a microchemical analysis of a sample of uraninite. |
| ⓘZircon Formula:Zr(SiO4) Habit: as small crystals in biotite or microcline References: |
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| ⓘ | Molybdenite | 2.EA.30 | MoS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Marcasite | 2.EB.10a | FeS2 |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| Group 3 - Halides | |||
| ⓘ | Fluorite | 3.AB.25 | CaF2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Ilmenite | 4.CB.05 | Fe2+TiO3 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | var. Smoky Quartz | 4.DA.05 | SiO2 |
| ⓘ | Opal var. Opal-AN | 4.DA.10 | SiO2 · nH2O |
| ⓘ | 4.DA.10 | SiO2 · nH2O | |
| ⓘ | Rutile | 4.DB.05 | TiO2 |
| ⓘ | Uraninite | 4.DL.05 | UO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| ⓘ | Fluorapatite | 8.BN.05 | Ca5(PO4)3F |
| Group 9 - Silicates | |||
| ⓘ | Almandine | 9.AD.25 | Fe2+3Al2(SiO4)3 |
| ⓘ | Zircon | 9.AD.30 | Zr(SiO4) |
| ⓘ | Titanite | 9.AG.15 | CaTi(SiO4)O |
| ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ | Allanite-(Ce) | 9.BG.05b | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| ⓘ | Beryl var. Aquamarine | 9.CJ.05 | Be3Al2Si6O18 |
| ⓘ | 9.CJ.05 | Be3Al2(Si6O18) | |
| ⓘ | var. Heliodor | 9.CJ.05 | Be3Al2(Si6O18) |
| ⓘ | var. Goshenite | 9.CJ.05 | Be3Al2(Si6O18) |
| ⓘ | Schorl | 9.CK.05 | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | Siderophyllite ? | 9.EC.20 | KFe2+2Al(Al2Si2O10)(OH)2 |
| ⓘ | Chamosite | 9.EC.55 | (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8 |
| ⓘ | Microcline | 9.FA.30 | K(AlSi3O8) |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
| ⓘ | var. Oligoclase | 9.FA.35 | (Na,Ca)[Al(Si,Al)Si2O8] |
| Unclassified | |||
| ⓘ | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| ⓘ | 'Feldspar Group' | - | |
| ⓘ | 'Gummite' ? | - | |
| ⓘ | 'Feldspar Group var. Perthite' | - | |
| ⓘ | 'Almandine-Spessartine Series' | - | |
| ⓘ | 'Columbite-(Fe)-Columbite-(Mn) Series' ? | - | |
| H | Hydrogen | |
|---|---|---|
| H | ⓘAllanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| H | ⓘBiotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| H | ⓘChamosite | (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8 |
| H | ⓘEpidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| H | ⓘOpal var.Opal-AN | SiO2 · nH2O |
| H | ⓘMuscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘOpal | SiO2 · nH2O |
| H | ⓘSchorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| H | ⓘSiderophyllite | KFe22+Al(Al2Si2O10)(OH)2 |
| H | ⓘMuscovite var.Sericite | KAl2(AlSi3O10)(OH)2 |
| Be | Beryllium | |
| Be | ⓘBeryl var.Aquamarine | Be3Al2Si6O18 |
| Be | ⓘBeryl | Be3Al2(Si6O18) |
| Be | ⓘBeryl var.Heliodor | Be3Al2(Si6O18) |
| Be | ⓘBeryl var.Goshenite | Be3Al2(Si6O18) |
| B | Boron | |
| B | ⓘSchorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| C | Carbon | |
| C | ⓘCalcite | CaCO3 |
| O | Oxygen | |
| O | ⓘAlbite | Na(AlSi3O8) |
| O | ⓘAllanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| O | ⓘBeryl var.Aquamarine | Be3Al2Si6O18 |
| O | ⓘAlmandine | Fe32+Al2(SiO4)3 |
| O | ⓘBiotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| O | ⓘBeryl | Be3Al2(Si6O18) |
| O | ⓘCalcite | CaCO3 |
| O | ⓘChamosite | (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8 |
| O | ⓘEpidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘFluorapatite | Ca5(PO4)3F |
| O | ⓘOpal var.Opal-AN | SiO2 · nH2O |
| O | ⓘIlmenite | Fe2+TiO3 |
| O | ⓘMicrocline | K(AlSi3O8) |
| O | ⓘMuscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘAlbite var.Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| O | ⓘOpal | SiO2 · nH2O |
| O | ⓘQuartz | SiO2 |
| O | ⓘRutile | TiO2 |
| O | ⓘSchorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| O | ⓘSiderophyllite | KFe22+Al(Al2Si2O10)(OH)2 |
| O | ⓘQuartz var.Smoky Quartz | SiO2 |
| O | ⓘTitanite | CaTi(SiO4)O |
| O | ⓘUraninite | UO2 |
| O | ⓘZircon | Zr(SiO4) |
| O | ⓘBeryl var.Heliodor | Be3Al2(Si6O18) |
| O | ⓘBeryl var.Goshenite | Be3Al2(Si6O18) |
| O | ⓘAlmandine-Spessartine Series | |
| O | ⓘColumbite-(Fe)-Columbite-(Mn) Series | |
| O | ⓘMuscovite var.Sericite | KAl2(AlSi3O10)(OH)2 |
| F | Fluorine | |
| F | ⓘBiotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| F | ⓘFluorapatite | Ca5(PO4)3F |
| F | ⓘFluorite | CaF2 |
| Na | Sodium | |
| Na | ⓘAlbite | Na(AlSi3O8) |
| Na | ⓘAlbite var.Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| Na | ⓘSchorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Mg | Magnesium | |
| Mg | ⓘBiotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Mg | ⓘChamosite | (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8 |
| Al | Aluminium | |
| Al | ⓘAlbite | Na(AlSi3O8) |
| Al | ⓘAllanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| Al | ⓘBeryl var.Aquamarine | Be3Al2Si6O18 |
| Al | ⓘAlmandine | Fe32+Al2(SiO4)3 |
| Al | ⓘBiotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Al | ⓘBeryl | Be3Al2(Si6O18) |
| Al | ⓘChamosite | (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8 |
| Al | ⓘEpidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Al | ⓘMicrocline | K(AlSi3O8) |
| Al | ⓘMuscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘAlbite var.Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| Al | ⓘSchorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Al | ⓘSiderophyllite | KFe22+Al(Al2Si2O10)(OH)2 |
| Al | ⓘBeryl var.Heliodor | Be3Al2(Si6O18) |
| Al | ⓘBeryl var.Goshenite | Be3Al2(Si6O18) |
| Al | ⓘAlmandine-Spessartine Series | |
| Al | ⓘMuscovite var.Sericite | KAl2(AlSi3O10)(OH)2 |
| Si | Silicon | |
| Si | ⓘAlbite | Na(AlSi3O8) |
| Si | ⓘAllanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| Si | ⓘBeryl var.Aquamarine | Be3Al2Si6O18 |
| Si | ⓘAlmandine | Fe32+Al2(SiO4)3 |
| Si | ⓘBiotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Si | ⓘBeryl | Be3Al2(Si6O18) |
| Si | ⓘChamosite | (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8 |
| Si | ⓘEpidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | ⓘOpal var.Opal-AN | SiO2 · nH2O |
| Si | ⓘMicrocline | K(AlSi3O8) |
| Si | ⓘMuscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘAlbite var.Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| Si | ⓘOpal | SiO2 · nH2O |
| Si | ⓘQuartz | SiO2 |
| Si | ⓘSchorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Si | ⓘSiderophyllite | KFe22+Al(Al2Si2O10)(OH)2 |
| Si | ⓘQuartz var.Smoky Quartz | SiO2 |
| Si | ⓘTitanite | CaTi(SiO4)O |
| Si | ⓘZircon | Zr(SiO4) |
| Si | ⓘBeryl var.Heliodor | Be3Al2(Si6O18) |
| Si | ⓘBeryl var.Goshenite | Be3Al2(Si6O18) |
| Si | ⓘAlmandine-Spessartine Series | |
| Si | ⓘMuscovite var.Sericite | KAl2(AlSi3O10)(OH)2 |
| P | Phosphorus | |
| P | ⓘFluorapatite | Ca5(PO4)3F |
| S | Sulfur | |
| S | ⓘArsenopyrite | FeAsS |
| S | ⓘChalcopyrite | CuFeS2 |
| S | ⓘMarcasite | FeS2 |
| S | ⓘMolybdenite | MoS2 |
| S | ⓘPyrite | FeS2 |
| S | ⓘPyrrhotite | Fe1-xS |
| K | Potassium | |
| K | ⓘBiotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| K | ⓘMicrocline | K(AlSi3O8) |
| K | ⓘMuscovite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘSiderophyllite | KFe22+Al(Al2Si2O10)(OH)2 |
| K | ⓘMuscovite var.Sericite | KAl2(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘAllanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| Ca | ⓘCalcite | CaCO3 |
| Ca | ⓘEpidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Ca | ⓘFluorapatite | Ca5(PO4)3F |
| Ca | ⓘFluorite | CaF2 |
| Ca | ⓘAlbite var.Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| Ca | ⓘTitanite | CaTi(SiO4)O |
| Ti | Titanium | |
| Ti | ⓘBiotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Ti | ⓘIlmenite | Fe2+TiO3 |
| Ti | ⓘRutile | TiO2 |
| Ti | ⓘTitanite | CaTi(SiO4)O |
| Mn | Manganese | |
| Mn | ⓘAlmandine-Spessartine Series | |
| Mn | ⓘColumbite-(Fe)-Columbite-(Mn) Series | |
| Fe | Iron | |
| Fe | ⓘAllanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| Fe | ⓘArsenopyrite | FeAsS |
| Fe | ⓘAlmandine | Fe32+Al2(SiO4)3 |
| Fe | ⓘBiotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Fe | ⓘChalcopyrite | CuFeS2 |
| Fe | ⓘChamosite | (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8 |
| Fe | ⓘEpidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | ⓘIlmenite | Fe2+TiO3 |
| Fe | ⓘMarcasite | FeS2 |
| Fe | ⓘPyrite | FeS2 |
| Fe | ⓘPyrrhotite | Fe1-xS |
| Fe | ⓘSchorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Fe | ⓘSiderophyllite | KFe22+Al(Al2Si2O10)(OH)2 |
| Fe | ⓘAlmandine-Spessartine Series | |
| Fe | ⓘColumbite-(Fe)-Columbite-(Mn) Series | |
| Cu | Copper | |
| Cu | ⓘChalcopyrite | CuFeS2 |
| As | Arsenic | |
| As | ⓘArsenopyrite | FeAsS |
| Zr | Zirconium | |
| Zr | ⓘZircon | Zr(SiO4) |
| Nb | Niobium | |
| Nb | ⓘColumbite-(Fe)-Columbite-(Mn) Series | |
| Mo | Molybdenum | |
| Mo | ⓘMolybdenite | MoS2 |
| Ce | Cerium | |
| Ce | ⓘAllanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| U | Uranium | |
| U | ⓘUraninite | UO2 |