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Prosopite

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Formula:
CaAl2(F,OH)8
System:
Monoclinic
Colour:
Greyish, white; ...
Lustre:
Vitreous, Dull
Hardness:
Name:
From the Greek προσωπείον, a mask, in allusion to the deceptive character of the mineral (as pseudomorphs).
Prosopite can form as an alteration product of topaz in topaz-rich greisens (as in Altenberg, Saxony and Schlaggenwald, Bohemia), and in cryolite-bearing pegmatites, either as a primary mineral or as an alteration product of cryolite.


Classification of Prosopite

Approved, 'Grandfathered' (first described prior to 1959)
3.CD.10

3 : HALIDES
C : Complex halides
D : Ino-aluminofluorides
11.6.9.1

11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
8.6.13

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
6 : Halides of Al

Physical Properties of Prosopite

Vitreous, Dull
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Greyish, white; colourless in transmitted light.
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
Perfect
On {111}.
Fracture:
Irregular/Uneven, Conchoidal
Density:
2.88 - 2.894 g/cm3 (Measured)    2.898 g/cm3 (Calculated)

Optical Data of Prosopite

Type:
Biaxial (+)
RI values:
nα = 1.501 nβ = 1.503 nγ = 1.510
2V:
Measured: 62° , Calculated: 58°
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
none

Chemical Properties of Prosopite

Formula:
CaAl2(F,OH)8
Elements listed in formula:

Crystallography of Prosopite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Cell Parameters:
a = 6.68Å, b = 11.19Å, c = 7.38Å
β = 94.93°
Ratio:
a:b:c = 0.597 : 1 : 0.66
Unit Cell Volume:
V 549.61 ų (Calculated from Unit Cell)
Morphology:
Crystals somewhat tabular {010}. Massive, granular to powdery.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Occurrences of Prosopite

Type Occurrence of Prosopite

Geological Setting of Type Material:
Topaz-bearing greisen.
Associated Minerals at Type Locality:

Relationship of Prosopite to other Species

8.6.1ZharchikhiteAl(OH)2F
8.6.2ChloraluminiteAlCl3 · 6H2O
8.6.3CadwaladeriteAlCl(OH)2 · 4H2O
8.6.4CryolithioniteNa3Al2(LiF4)3
8.6.5CryoliteNa3AlF6
8.6.6ChioliteNa5Al3F14
8.6.7ElpasoliteK2NaAlF6
8.6.8WeberiteNa2MgAlF7
8.6.9Hydrokenoralstonite2Al2F6(H2O)
8.6.10KoeneniteNa4Mg9Al4Cl12(OH)22
8.6.11 Chlor-manasseiteMgxAl(OH)2x+2Cl · (x-0.8)H2O x about 1.75
8.6.12GearksutiteCaAlF4(OH) · H2O
8.6.14YaroslaviteCa3Al2F10(OH)2 · H2O
8.6.15CarlhintzeiteCa2AlF7 · H2O
8.6.16ColquiriiteCaLiAlF6
8.6.17ThomsenoliteNaCaAlF6 · H2O
8.6.18PachnoliteNaCaAlF6 · H2O
8.6.19Zirklerite(Fe,Mg)9Al4Cl18(OH)12 · 14H2O

Other Names for Prosopite

Name in Other Languages:

Other Information

Other Information:
Decomposed by H2SO4.
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 Prosopite

Reference List:
Charpentier (1799) Beob. über die Lagerst. der Erze, Leipzig: 32 (as Speckstein).

Breithaupt (1815) Über die Aechtheit der Kryst., Freiberg: 29.

Scheerer, T. (1853) Ueber Pseudomorphosen, nebst Beiträgen zur Charakteristik einiger Arten derselben.- Poggendorffs Annalen der Physik und Chemie: 90: 315-323 (as Prosopit).

Scheerer, T. (1854) Poggendorffs Annalen der Physik und Chemie: 92: 612 (as Prosopit).

Scheerer, T. (1857) Poggendorffs Annalen der Physik und Chemie: 101: 361 (as Prosopit).

Groth (1883) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 7: 487.

Cross and Hillebrand (1885) USGS Bull. 20: 62.

Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 178.

Hillebrand (1899) American Journal of Science: 7: 54.

Goldschmidt, V. (1920) Atlas der Krystallformen. 9 volumes, atlas, and text: vol. 6: 176.

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 123.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 121-122.

Neues Jahrbuch für Mineralogie, Monatshefte (1986): 7: 329-335.

Internet Links for Prosopite

mindat.org URL:
https://www.mindat.org/min-3287.html
Please feel free to link to this page.

Localities for Prosopite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia
 
  • Tasmania
    • Waratah-Wynyard municipality
      • Waratah district
        • Waratah
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 122; Bottrill
Canada
 
  • British Columbia
    • Golden Mining Division
      • Rock Canyon Creek
Jennifer Pell (1994) Carbonatites, Nepheline Syenites, Kimberlites and Related Rocks in British Columbia. Brithish Columbia Ministry of Energy Bulletin 88.
China
 
  • Jiangxi Province
    • Yingtan Prefecture
      • Guixi Co.
        • Shengyuan Uranium ore field (Yingtan Uranium ore field)
Dahlkamp, F.J., Ed. (2009): Uranium Deposits of the World. Springer (Berlin, Heidelberg), pp. 31-156
Dahlkamp, F.J., Ed. (2009): Uranium Deposits of the World. Springer (Berlin, Heidelberg), pp. 31-156
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Karlovy Vary Region
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 122.
Finland
 
  • Southern Finland Region
    • Kotka
Ilkka Mikkola collection
Lahti Seppo I. 2011. Kotkan topaasilouhoksesta ja sen mineraaleista. Kivi-lehti 4.
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Wolfach
        • Oberwolfach
          • Rankach valley
Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German); KOLITSCH, U. (1997): Ianthinit und weitere Neufunde aus der Grube Clara im mittleren Schwarzwald. - Erzgräber 11 (2), 76-88.
  • Saxony
    • Erzgebirge
      • Altenberg
T. Scheerer (1853): Ueber Pseudomorphosen, nebst Beiträgen zur Charakteristik einiger Arten derselben.- Poggendorffs Annalen der Physik und Chemie 90, 315-323; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 122; Lapis 35 (5) (2010) 45-46.
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
Kolitsch, U., Rieck, B., Brandstätter, F., Schreiber, F., Fabritz, K. H., Blaß, G. & Gröbner, J. (2014): Neufunde aus dem altem Bergbau und den Schlacken von Lavrion (I). Mineralien-Welt 25 (1), 60-75 (in German). [identification announced; no description given yet]
Greenland
 
  • Sermersooq
    • Arsuk Fjord
      • Ivittuut (Ivigtut)
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 112.; Petersen, O.V. and Secher, K. (1993): The minerals of Greenland. Mineralogical Record 24 (2): 1-65 (p.36)
Kazakhstan
 
  • Eastern Kazakhstan Province (Shyghys Qazaqstan Oblysy; Vostochno-Kazakhstanskaya Oblast')
    • Tarbagatai Range
      • Akzhaylyautas Mts (Akzhailyautas Mts; Akjaylautas Mts; Akzhalautas Mts)
Pavel M. Kartashov data
  • Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
    • Balkhash Region (Balqash; Karatas; Prebalkhashie)
      • Balkhash (Balqash)
        • Kounrad Massif
Chen Xuanhua, Qu Wenjun, Han Shuqin, Seitmuratova, E., Yang Nong, Chen Zhengle, Zeng Fagang, Du Andao, and Wang Zhihong (2010): Geoscience Frontiers 1(1), 115-124
http://geo.web.ru/druza/l-Kent.htm
Mexico
 
  • Zacatecas
    • Mun. de Mazapil
      • Noche Buena
Rob Lavinsky
      • Santa Rosa
Panczner (1987): 143-398.
Namibia
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Keller, P. & Innes, J. (1986): "Neue Minerale von Tsumeb." Lapis, 11 (9), 28-32.
Russia
 
  • Eastern-Siberian Region
    • Transbaikalia (Zabaykalye)
      • Chitinskaya Oblast'
Starikova, Sharygin, V.V. (2015): Ba-dominant fluoroaluminates from the Katugin rare-metal deposit (Transbaikalia, Russia): chemical and Raman data. XXXII International Conference "Alkaline Magmatism of the Earth and Related Strategic Metal Deposits", August 7-14, Apatity, Kola, Russia
Ripp, G. S., Bulnaev, K. B. & Zyablishchev, A. Yu. (1996): Alumofluorides of Zharchikhinskoe molybdenum deposit (western Transbaikalia). Zap. Vseross. Mineral. O-va. 125, 72-79. (in Russian) ; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
        • Ilmen Mts
          • Ilmen Natural Reserve
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; Bailey, J. C: Formation of cryolite and other aluminofluorides: A petrologic review. Bull. geol. Soc. Denmark, vol. 29, pp. 1-45. Copenhagen, June 10th, 1980.
South Africa
 
  • Gauteng Province
    • Pretoria District (Tshwane District)
Minerals of South Africa; Rocks & Minerals 83:5 pp 410-421
UK
 
  • England
    • North Yorkshire
      • North Pennines
        • Pateley Bridge District
          • Greenhow
Young, B.; Ryback, G.; Braithwaite, R. S. W.; Francis, J. G. (1997): Prosopite, doyleite and otavite from Coldstones quarry, Pateley bridge, North Yorkshire. Mineralogical Magazine 61, 895-897.
Ukraine
 
  • Zhytomyr Oblast' (Zhitomir Oblast')
Yurk Yu.Yu., Gurov E.P., Gurova E.P. (1973) Pecularities of fluorin mineralogy of Ukrainian crystalline shield, - Naukova Dumka, Kiev, pp.184 (in Russian).; Bailey, J. C: Formation of cryolite and other aluminofluorides: A petrologic review. Bull. geol. Soc. Denmark, vol. 29, pp. 1-45. Copenhagen, June 10th, 1980.
USA
 
  • Arizona
    • Gila Co.
      • Globe-Miami District
        • Miami-Inspiration District
          • Top of the World
Confirmed by Raman spectroscopy at the University of Arizona.
    • Graham Co.
      • Aravaipa District
        • Santa Teresa Mts
          • Klondyke
            • Grand Reef Mountain
              • Laurel Canyon
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 335.
    • La Paz Co.
      • Plomosa Mts
        • Plomosa District
          • Bouse
            • Bouse area
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 335.
  • Colorado
    • El Paso Co.
      • Cheyenne District (St. Peters Dome District)
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 122; Kearns, 1995 - "Alumino-Fluorides from the Morefield Pegmatite", Mineralogical Record 26 551-557.
Am Min 51:299-323
Pavel M. Kartashov analytical data, Allum Dean specimens
Minerals of Colorado (1997) Eckels, E. B.; Am Min 51:299-323; American Mineralogist (1936): 20: 319-333
    • Fremont Co.
"Minerals of Colorado, updated & revised", p. 16, by Eckel, Edwin B., 1997; Armbrustmacher, T. J. (1988) Geology and resources of thorium and associated elements in the Wet Mountains area, Fremont and Custer counties, Colorado. USGS Professional Paper: 1049-F
  • Nevada
    • Mineral Co.
      • Fitting District
        • Gillis Range
Mineralogical Record: 31: 204.
  • New Mexico
    • Doña Ana Co.
      • Franklin Mts
        • Northern Franklin Mountains
New Mexico Geology v. 25
  • Utah
    • Tooele Co.
      • Dugway Range
        • Dugway Mountains District
UGMS Bull 117 Minerals and Mineral Localities of Utah
      • Wildcat Mountain
UGMS Bull 117 Minerals and Mineral Localities of Utah
  • Virginia
    • Amelia Co.
      • Winterham
[Kearns, 1995 - "Alumino-Fluorides from the Morefield Pegmatite", Mineralogical Record 26 551-557]; Richards, R. P., Kearns, L. E., & Cook, W. R. (1998). Morphology of Chiolite twins from the Morefield mine, Amelia County, Virginia. Canadian mineralogist, 36, 1009-1016.
  • Wisconsin
    • Marathon Co.
      • Wausau Intrusive Complex
        • Nine Mile pluton
Rocks & Min. (2007) 82:233
Mineral and/or Locality  
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