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Krásnoite

A valid IMA mineral species
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EditAdd SynonymEdit CIF structuresClear Cache
Ca3Al7.7Si3P4O23.5(OH)12.1F2 · 8H2O
Colour:
Snow white, pale yellowish white, white with a greenish tint
Lustre:
Greasy, Pearly, Dull
Hardness:
5
Specific Gravity:
2.48
Crystal System:
Trigonal
Member of:
Perhamite Group
Name:
Named for the district where the species was first discovered ‒ the Krásno ore district.
Co-Type Localities:
ⓘHuber stock (Huber shaft; Hub stock), Krásno, Sokolov District, Karlovy Vary Region, Czech Republic
ⓘSilver Coin Mine, Valmy, Iron Point Mining District, Humboldt County, Nevada, USA
Once thought to be the fluorophosphate analogue ofperhamite but according to McCubbin et al. (2018) (see also IMA 17-E proposal) F and OH are bonded to Al.

Visually similar toperhamite,crandallite,plumbogummite andiangreyite.


Unique Identifiers
IMA status notes:
Redefined by the IMA
IMA Formula:
Ca3Al7.7Si3P4O22.9(OH)13.3F2 · 8H2O
Approval year:
2011
First published:
2012
Approval history:
2011: Approved by IMA as a new species (IMA2011-040)
2017: Redefined by IMA (IMA 17-E)
Type description reference:
Mills, S. J., Sejkora, J., Kampf, A. R., Grey, I. E., Bastow, T. J., Ball, N. A., Adams, P. M., Raudsepp, M., Cooper, M. A. (2012) Krásnoite, the fluorophosphate analogue of perhamite, from the Huber open pit, Czech Republic and the Silver Coin mine, Nevada, USA.Mineralogical Magazine, 76 (3) 625-634doi:10.1180/minmag.2012.076.3.13

Classification of Krásnoite

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
O : With CO3, SO4, SiO4
Dana 8th ed.:
43.5.10.2

43 : COMPOUND PHOSPHATES, ETC.
5 : Hydrated Compound Phosphates, etc·, Containing Hydroxyl or Halogen

Mineral Symbols
Transparency:
Transparent
Colour:
Snow white, pale yellowish white, white with a greenish tint
Streak:
White
Hardness:
5 onMohs scale
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
On {001}
Fracture:
Irregular/Uneven
Density:
2.48(4) g/cm3 (Measured)    2.476 g/cm3 (Calculated)
Comment:
Measured by the sink-float method in an aqueous solution of sodium polytungstate

Optical Data of Krásnoite
Surface Relief:
Moderate

Chemistry of Krásnoite

Crystallography of Krásnoite
General Appearance of Type Material:
Compact to finely crystalline aggregates, balls and rosette-like clusters up to 1 mm across. Individual crystals are platy, with a hexagonal outline and reach 0.1-0.4 mm.
Place of Conservation of Type Material:
National Museum Prague, catalogue number P1P 2/2011 (Krásno); Natural History Museum of Los Angeles County catalogue number 62372 and 62373 (Silver Coin).
Associated Minerals at Type Locality:
AluniteBaryteCacoxeniteChalcosiderite-Turquoise SeriesCrandallite
FluelliteFluorapatiteGoethiteIangreyiteJarosite
KidwelliteKolbeckiteLeucophosphiteLipscombiteMeurigite-Na
PharmacosideritePlimeriteQuartzRockbridgeiteStrengite-Variscite Series
VarisciteWarditeZinclipscombite
Reference:
Mills, S. J., Sejkora, J., Kampf, A. R., Grey, I. E., Bastow, T. J., Ball, N. A., Adams, P. M., Raudsepp, M., Cooper, M. A. (2012) Krásnoite, the fluorophosphate analogue of perhamite, from the Huber open pit, Czech Republic and the Silver Coin mine, Nevada, USA.Mineralogical Magazine, 76 (3) 625-634doi:10.1180/minmag.2012.076.3.13

Synonyms of Krásnoite

Other Language Names for Krásnoite

Relationship of Krásnoite to other Species
Other Members of Perhamite Group:
PerhamiteCa3Al7.7Si3P4O23.5(OH)14.1 · 8H2OTrig.3m(32/m) :P3m1
Chemically related to group(s):
Plumbogummite GroupA subgroup of theAlunite Supergroup.

Common AssociatesMon. 2/m :B2/m8.DO.05GirvasiteNaCa2Mg3(PO4)3(CO3)(H2O)6Mon. 2/m :P21/b8.DO.10VoggiteNa2Zr(PO4)(CO3)(OH) · 2H2OMon. 2/m8.DO.15PeisleyiteNa2Al9[(P,S)O4]8(OH)6 · 28H2OTric. 1 :P18.DO.20PerhamiteCa3Al7.7Si3P4O23.5(OH)14.1 · 8H2OTrig.3m(32/m) :P3m18.DO.25Saryarkite-(Y)Ca(Y,Th)Al5(SiO4)2(PO4,SO4)2(OH)7 · 6H2OTet. 4228.DO.30Micheelsenite(Ca2Y)Al(PO3OH)(CO3)(OH)6 · 12H2OHex. 6 :P638.DO.40Parwanite(Na,K)(Mg,Ca)4Al8(PO4)8(CO3)(OH)7 · 30H2OMon. 2 :P28.DO.45SkorpioniteCa3Zn2(PO4)2(CO3)(OH)2 · H2OMon. 2/m :B2/b8.DO.50Jörgkellerite(Na,◻)3Mn3+3(PO4)2(CO3)(O,OH)2 · 5H2OTrig.3 :P38.DO.55JuansilvaiteNa5Al3[AsO3(OH)]4[AsO2(OH)2]2(SO4)2 · 4H2OMon. 2/m :B2/b8.DO.60VanderheydeniteZn6(PO4)2(SO4)(OH)4 · 7H2OMon. 2/m

Fluorescence of Krásnoite

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    • References for KrásnoiteⓘHuber stock (Huber shaft; Hub stock) (TL)Williams et al. (2011)+2 other references
    France
     
    Boisson et al. (2018)Boisson et al. (2020)
    Germany
     
    Christian Rewitzer collection
    Portugal
     
    Alves et al. (2013)ALVES et al. (2013)
    USA (TL)
     
    Williams et al. (2011)Thomas Loomis CollectionMills et al. (2012)
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