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Krásnoite

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About KrásnoiteHide

Formula:
Ca3Al7.7Si3P4O23.5(OH)12.1F2 · 8H2O
Crystal System:
Trigonal
Member of:
Name:
Named for the district where the species was first discovered ‒ the Krásno ore district.
Once thought to be the fluorophosphate analogue of perhamite but according to McCubbin et al. (2018) (see also IMA 17-E proposal) F and OH are bonded to Al.

Visually similar to perhamite, crandallite, plumbogummite and iangreyite.


Classification of KrásnoiteHide

Approved
Notes:
Redefined by the IMA
Approval Year:
2011
Approval History:
2011: Approved by IMA as a new species (IMA2011-040)
2017: Redefined by IMA (IMA 17-E)
8.DO.20

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

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

Chemical Properties of KrásnoiteHide

Formula:
Ca3Al7.7Si3P4O23.5(OH)12.1F2 · 8H2O
IMA Formula:
Ca3Al7.7Si3P4O22.9(OH)13.3F2 · 8H2O

Crystallography of KrásnoiteHide

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
P3m1
Cell Parameters:
a = 6.9956(4) Å, c = 20.200(2) Å
Ratio:
a:c = 1 : 2.888
Unit Cell V:
856.09 ų
Z:
3

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
20.186(97)
6.736(100)
5.800(67)
3.496(60)
2.873(87)
2.763(73)
2.104(75)
1.748(64)

Type Occurrence of KrásnoiteHide

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).

Synonyms of KrásnoiteHide

Relationship of Krásnoite to other SpeciesHide

Member of:
Other Members of this group:
PerhamiteCa3Al7.7Si3P4O23.5(OH)14.1 · 8H2OTrig. 3m (3 2/m) : P3m1
Chemically related to group(s):

Common AssociatesHide

Associated Minerals Based on Photo Data:
Earlshannonite2 photos of Krásnoite associated with Earlshannonite on mindat.org.
Chalcosiderite2 photos of Krásnoite associated with Chalcosiderite on mindat.org.
Plimerite1 photo of Krásnoite associated with Plimerite on mindat.org.
Triplite1 photo of Krásnoite associated with Triplite on mindat.org.
Beraunite1 photo of Krásnoite associated with Beraunite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.DO.05GirvasiteNaCa2Mg3(PO4)3(CO3)(H2O)6Mon. 2/m : P21/b
8.DO.10VoggiteNa2Zr(PO4)(CO3)(OH) · 2H2OMon.
8.DO.15PeisleyiteNa2Al9[(P,S)O4]8(OH)6•28H2OTric. 1 : P1
8.DO.20PerhamiteCa3Al7.7Si3P4O23.5(OH)14.1 · 8H2OTrig. 3m (3 2/m) : P3m1
8.DO.25Saryarkite-(Y)Ca(Y,Th)Al5(SiO4)2(PO4,SO4)2(OH)7 · 6H2OTet. 4 2 2
8.DO.30Micheelsenite(Ca,Y)3Al(HPO4,CO3)(CO3)(OH)6 · 12H2OHex.
8.DO.40Parwanite(Na,K)(Mg,Ca)4Al8(PO4)8(CO3)(OH)7 · 30H2OMon. 2 : P2
8.DO.45SkorpioniteCa3Zn2(PO4)2(CO3)(OH)2 · H2OMon. 2/m : B2/b

Related Minerals - Dana Grouping (8th Ed.)Hide

43.5.10.1PerhamiteCa3Al7.7Si3P4O23.5(OH)14.1 · 8H2OTrig. 3m (3 2/m) : P3m1

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for KrásnoiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mills, S.J., Sejkora, J., Kampf, A.R., Grey, I.E., Bastow, T.J., Ball, N.A., Adams, P.M., Raudsepp, M. and Cooper, M.A. (2011) Krásnoite, IMA 2011-040. CNMNC Newsletter No. 10, October 2011, page 2557; Mineralogical Magazine, 75, 2549-2561.
Mills, S.J., Sejkora, J., Kampf, A.R., Grey, I.E., Bastow, T.J., Ball, N.A., Adams, P.M., Raudsepp, M. and 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, 625-634.
McCubbin, F.M., Phillips, B.L., Adcock, C.T., Tait, K.T., Steele, A., Vaughn, J.S., Fries, M.D., Atudorei, V., Vander Kaaden, K.E., Hausrath, E.M. (2018): Discreditation of bobdownsite and the establishment of criteria for the identification of minerals with essential monofluorophosphate (PO3F2–). American Mineralogist, 103, 1319–1328.

Internet Links for KrásnoiteHide

Localities for KrásnoiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Czech Republic (TL)
 
  • Karlovy Vary Region
    • Horní Slavkov (Schlaggenwald)
      • Krásno (Schönfeld)
Mills, S.J., Sejkora, J., Kampf, A.R., Grey, I.E., Bastow, T.J., Ball, N.A., Adams, P.M., Raudsepp, M. and Cooper, M.A. (2011) Krásnoite, IMA 2011-040. CNMNC Newsletter No. 10, October 2011, page 2557; Mineralogical Magazine, 75, 2549-2561.
France
 
  • Auvergne-Rhône-Alpes
    • Allier
      • Ébreuil
        • Échassières
Boisson, J.-M., Leconte, J. (2018) Analyses 2017 MNHN-Micromonteurs. La revue des Micromonteurs, 27, 3-33
Portugal
 
  • Guarda District
    • Sabugal
      • Bendada
Alves, P. and Mills, S. (2013) Nuevos datos sobre los fosfatos de Bendada, Sabugal Portugal). Acopios, 4, 349-377
ALVES, P., MILLS, S. (2013) Nuevos datos sobre los fosfatos de Bendada, Sabugal (Portugal). ACOPIOS-Revista Ibérica de Mineralogía, Vol 4 (2013): 349-377.
USA (TL)
 
  • Nevada
    • Humboldt Co.
      • Iron Point District
        • Valmy
Mills, S.J., Sejkora, J., Kampf, A.R., Grey, I.E., Bastow, T.J., Ball, N.A., Adams, P.M., Raudsepp, M. and Cooper, M.A. (2011) Krásnoite, IMA 2011-040. CNMNC Newsletter No. 10, October 2011, page 2557; Mineralogical Magazine, 75, 2549-2561.
  • Utah
    • Box Elder Co.
      • Pilot Range
        • Lucin District
          • Lucin
            • Utahlite Hill
Mills, S.J., Sejkora, J., Kampf, A.R., Grey, I.E., Bastow, T.J., Ball, N.A., Adams, P.M., Raudsepp, M. and 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, 625 - 634.
Mineral and/or Locality  
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