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Rockbridgeite

A valid IMA mineral species - grandfathered
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Photos of Rockbridgeite (199)
Rockbridgeite GallerySearch Photos of Rockbridgeite
EditAdd SynonymEdit CIF structuresClear Cache
Fe2+Fe3+4(PO4)3(OH)5
Colour:
Dark green, olive-green, brown, yellow-brown, greenish black, black
Lustre:
Sub-Vitreous, Resinous, Waxy, Greasy, Silky
Hardness:
3½ - 4½
Specific Gravity:
3.45 - 3.6
Crystal System:
Orthorhombic
Member of:
Rockbridgeite Group
Name:
Named in 1949 by Clifford Frondel for the type locality at the Midvale Mine, South Mountain, Midvale, Rockbridge County, Virginia, USA.
Type Locality:
ⓘMidvale Mine, South Mountain, Midvale, Rockbridge County, Virginia, USA
Isostructural with:
Frondelite,Plimerite
Rockbridgeite Group.Frondelite-Rockbridgeite Series.
The Fe2+-analogue offrondelite andplimerite.

A secondary mineral resulting from the alteration of primary phosphates.

Visually similar todufrénite andnatrodufrénite.

Compare chemically very similarferrorockbridgeite.


Unique Identifiers
IMA Formula:
(Fe2+0.5Fe3+0.5)2Fe3+3(PO4)3(OH)5

Classification of Rockbridgeite
Dana 8th ed.:
41.9.2.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
9 : (AB)5(XO4)3Zq
Hey's CIM Ref.:
19.12.16

19 : Phosphates
12 : Phosphates of Mn

Mineral SymbolsJolyon RalphUnited Kingdom

Physical Properties of Rockbridgeite
Transparency:
Translucent, Opaque
Comment:
The cruss-sections of botryoids is radially fibrous
Colour:
Dark green, olive-green, brown, yellow-brown, greenish black, black
Comment:
Commonly exhibits colour banding. May be bronze-brown or reddish brown when oxidized.
Streak:
Gray green, pale brown
Hardness:
3½ - 4½ onMohs scale
Tenacity:
Brittle
Cleavage:
Very Good
On {100}, excellent; on {010}, good; on {001}, fair.
Fracture:
Irregular/Uneven
Density:
3.45 - 3.6 g/cm3 (Measured)    3.60 g/cm3 (Calculated)

Optical Data of Rockbridgeite
Surface Relief:
Very High
Dispersion:
r < v, or r>v very strong
Pleochroism:
Visible
Comments:
X = Light brown to light yellow-brown
Y = Bluish green
Z = Dark bluish green

Chemistry of Rockbridgeite

Crystallography of Rockbridgeite
Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
6.87 Å(40)
4.842 Å(50)
4.630 Å(40)
3.573 Å(50)
3.196 Å(100)
2.409 Å(50)
1.5890 Å(50)

Geological Environment
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, USA - #80600.
Geological Setting of Type Material:
granite pegmatite

Synonyms of Rockbridgeite

Other Language Names for Rockbridgeite

Varieties of Rockbridgeite

Relationship of Rockbridgeite to other Species
Other Members of this group:
Ferrirockbridgeite(Fe3+0.67◻0.33)2(Fe3+)3(PO4)3(OH)4(H2O)Orth.mmm(2/m2/m2/m)
Ferrorockbridgeite(Fe2+,Mn2+)2(Fe3+)3(PO4)3(OH)4(H2O)Orth.mmm(2/m2/m2/m)
FrondeliteMn2+Fe3+4(PO4)3(OH)5Orth. 222 :C2221
ManganrockbridgeiteMn2+2Fe3+3(PO4)3(OH)4(H2O)Mon. 2/m :P21/m
PlimeriteZnFe3+4(PO4)3(OH)5Orth.mmm(2/m2/m2/m)
Forms a series with:
FrondeliteFrondelite-Rockbridgeite Series

Common AssociatesMon. 2/m :P21/m8.BC.Elaliite(Fe2+8Fe3+)(PO4)O8Orth.mmm(2/m2/m2/m) :Cmmm8.BC.ElkinstantoniteFe4(PO4)2OMon. 2/m :P21/b8.BC.05AngelelliteFe3+4(AsO4)2O3Tric.1 :P18.BC.10FrondeliteMn2+Fe3+4(PO4)3(OH)5Orth. 222 :C22218.BC.10Ferrirockbridgeite(Fe3+0.67◻0.33)2(Fe3+)3(PO4)3(OH)4(H2O)Orth.mmm(2/m2/m2/m)8.BC.10Ferrorockbridgeite(Fe2+,Mn2+)2(Fe3+)3(PO4)3(OH)4(H2O)Orth.mmm(2/m2/m2/m)8.BC.10PlimeriteZnFe3+4(PO4)3(OH)5Orth.mmm(2/m2/m2/m)8.BC.15AerugiteNi8.5(AsO4)2As5+O8Trig.3m(32/m) :R3m

Fluorescence of Rockbridgeite

Other Information
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    • External Links:
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  • Raman and XRD data at RRUFF project
  • References and PDF downloads at RRUFF project
  • American Mineralogist Crystal Structure Database
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    • References for RockbridgeiteⓘCerro Blanco pegmatite districtDina (1993)Demartin et al. (1997)Gay et al. (1991)+1 other referenceGALLISKI (1983)+1 other referenceRoda-Robles et al. (2012)
    Australia
     
    Birch et al. (1997)Birch et al. (1997)Rod Martin Collection inferred from ...Harrowfield et al. (1981)Peter ElliottAustralian Journal of MineralogyBosworth et al. (2001)Johnston et al. (1978)Australian Journal of MineralogyW.D.Birch. Phosphate Minerals of ...Birch (2018)Eagle et al. (2015)+1 other referenceEagle et al. (2015)Personally collected by Ryan Eagle in ...Birch et al. (1993)Birch (1996)Gole (1980)Peter Downes+1 other referenceHesperian Press+2 other references
    Austria
     
    Niedermayr et al. (2005)Aufschluss 1972 (SB)
    Belgium
     
    Van Tassel R. (1981)+6 other references
    Bolivia
     
    Kay Robertson collection
    Brazil
     
    Queiroz (2016)Gaines et al. (1979)Cassedanne et al. (1982)+1 other referencesergio varvelloBaijot et al. (2014)+1 other referenceKing (n.d.)+1 other referenceKing et al. (1993)fabreminerals specimenA. M. I. Martins collectionCassedanne et al. (1981)Atencio et al. (2004)Cassedanne et al. (1999) ...Sergio Varvello collectionCassedanne et al. (1973)King (n.d.)Witzke et al. (2000)Sergio Varvello collectionCoelho et al. (2025)
    Chile
     
    Cesar Menor-Salvan collection+1 other reference
    Czech Republic
     
    Povondra et al. (eds.)+1 other referenceSejkora et al. (2006)Sejkora et al. (2006)Jirásek J. et al. (2016)ŠkodaČ+4 other referencesStaně+4 other referencesStaněk (1997)
    DR Congo
     
    Thoreau (1957)+1 other reference
    Europe
     
    Berbain et al. (2012)
    Finland
     
    Teertstra et al. (1993)Geological Survey of Finland Bulletin ...
    France
     
    perso.wanadoo.fr (2004)Palache et al. (1951)Palache et al. (1951)Inventaire Minéralogique de la France ...Bull. Soc. Franç. Minéralo. ...Inventaire mineralogique de l'Ariege (Editions BRGM 1984)Bull. Soc. Franç. Minéralo. ...Berbain et al. (2005)Berbain et al. (2005)Berbain et al. (2012)Berbain et al. (2012)Lheur et al. (2010)+1 other reference
    Germany
     
    Walenta (1992)Weiß (1990)Weiß (1990)42. (in German)+1 other referenceFehr et al. (1985)Palache et al. (1951)+1 other referenceDill et al. (2012)Dill et al. (2008)+1 other referenceDill (2009)+3 other referencesDill H.G.: "Mineralogical and chemical ...+1 other referenceGrey et al. (2012)+2 other referencesHarald G. Dill and Radek Skoda (2015)Wittern (2001)+1 other referenceWeiß (1990)www.vfmg-weiden.de (2001)DILL et al. (2009)Weber (2013)in the collection of Christof SchäferWeiß (1990)Blaß (2002)Weiß (1990)Wittern (2001)Wittern (2001)+1 other referenceStieglitz et al. (1987)+1 other referenceWeiß (1990)Hucko (2010)Rolf Golze+3 other referencesHucko (2010)Habel (2011)Witzke et al. (2013)Wittern (2001)
    Italy
     
    VIGNOLA et al. (2007)Vignola P. et al. (2011)Vignola et al. (2011)
    Japan
     
    S. Matsubara (2000)Ganko-Gakkai Koen-Yoshi (Abstracts of the Meetings of Japanese Association of Mineralogists...)Yamada (2004)Matsubara et al. (1980)
    Kazakhstan
     
    Pekov (1998)Pekov (1998)
    Liberia
     
    Axelrod et al. (1952)
    Madagascar
     
    Behier (1960)Behier (1960)Behier (1960)
    Morocco
     
    Pavel.M. Kartashov (n.d.)+1 other referenceFavreau (2012)Favreau (2012)
    Namibia
     
    von Bezing (2007)Förch (1998)Keller et al. (1989)
    New Zealand
     
    Stott (pers. notes)
    Norway
     
    Larsen et al. (2013)+1 other reference
    Portugal
     
    Alves (n.d.)+1 other referencePedro Alves collection. Characterized ...Schnorrer-Köhler (1991)Alves (n.d.)Self-collected by Pedro Alves.PROSPEG – Projecto de prospecção+1 other referenceAlves (n.d.)4+4 other referencesAlves (n.d.)Neves (1960)Alves (n.d.)Mineralien AtlasNunes (n.d.)Correia Neves (1962)Alves (n.d.)Identified in Rebentão Mineself-findCorreia Neves (1966)
    Rwanda
     
    Royal Museum for Central AfricaHulsbosch et al. (2019)Daltry et al. (1998)
    South Africa
     
    Cairncross et al. (1995)
    Spain
     
    Roda et al. (2001)Encarnación Roda-Robles (2007)Roda-Robles et al. (2010)Roda-Robles et al. (2012)Roda-Robles et al. (1998)Garate-Olave I et al. (2014)Antonio Barahona Ortiz collectionNÚÑEZ-GARCÍA et al. (2012)+1 other referenceVérez et al. (2024)Calvo Rebollar (2015)
    Sweden
     
    Bjällerud (1989)+2 other referencesGustafson (1989)+1 other referenceSwedish Museum of Natural History (Naturarv database)
    Switzerland
     
    Weiß (1989)+1 other reference
    UK
     
    Golley et al. (1995)Kingsbury (1957)Weiß (1989)+1 other reference[J.Russel Soc 1998:15+2 other referencesKingsbury (MS1)+2 other referencesStanley et al. (1991)Alysson Rowan collectionKingsbury (1957)[Specimen in the Natural History MuseumLivingstone (1980)+1 other reference
    USA
     
    Barwood et al. (1978)+1 other referenceRocks & Min.: 58:57-62.Specimens collected by Jim StoopsBarwood et al. (1978)+1 other referenceCook et al. (1982)Dean (1995)Dean (1995)Rocks & Minerals: 70 (5)Chris Bryant.+1 other referenceCook et al. (1982)Howard+1 other referenceSmith (1988)Smith (1988)Rocks & Min.:64:297-298.Am Min 51:1811-1814Smith (1988)Smith (1988)Eckel et al. (1997)Januzzi et al. (1976)Januzzi (1976)Marc V. Hurst (2012)Denicourt+1 other referenceMarc V. Hurst (2012)Marc V. Hurst (2012)Jason Smith & M.E. Ciriotti (2005)King et al. (1994)Thompson et al. (2000)+1 other referenceMineral News (1995)+1 other referenceKing et al. (1994)+1 other referenceKing et al. (1994)King et al. (1994)+1 other referenceKing et al. (1994)+1 other referenceTim BlakeKing et al. (1994)Palache et al. (1951)Harvard Mineralogical MuseumSilver Coin Mine. Compact Disc. Paul ...Smith (2005)Hurlbut (1965)+1 other referenceP. Cristofono et al. (2011)Smith (2005)Palache et al. (1951)+2 other referencesPalache et al. (1951)+3 other referencesWhitmore et al. (2004)Rocks & Min.+2 other referencesThompson et al. (2022)Thompson+2 other referencesRocks & Min.:64:504.+1 other referenceSmith (2005)Henderson (1980)Locality description: "[...] all the ...Jeff WeismannB.A. Collection.Horton et al. (1981)+1 other referenceHenderson (1980)Min. Col. PA+2 other referencesRocks & Minerals 54:4 pp173-175Peacor (1969)+1 other referenceSmith et al. (2000)Rocks & Minerals: 60: 117.+1 other referenceSmith et al. (2000)Smith et al. (2000)Rocks & Minerals: 60: 116.Smith et al. (2000)Smith et al. (2000)Rocks & Minerals: 67 (6)Bullock (1981)Watson (1907)+1 other referenceRocks & Minerals: 64: 44.+3 other references
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