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About HorákiteHide

(Bi7O7OH)[(UO2)4(PO4)2(AsO4)2(OH)2] · 3.5H2O
Crystal System:
Horákite is named after Ing. František Horák (1882–1919) served from 1916 to 1918 as bergadjunkt and the responsible head of the Radium factory in St. Joachimsthal (Jáchymov) and his grandson MUDr. (M.D.) Vladimír Horák (born 1964) is an amateur mineral collector and historian, focused on the history of mining in Jáchymov.
New structure type. Quite unique with phosphate and arsenate groups occurring separately.

Classification of HorákiteHide

Approved, Pending publication
Approval Year:

Chemical Properties of HorákiteHide

(Bi7O7OH)[(UO2)4(PO4)2(AsO4)2(OH)2] · 3.5H2O

Crystallography of HorákiteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 21.374(2) Å, b = 15.451(3) Å, c = 12.168(2) Å
β = 122.26(1)°
a:b:c = 1.383 : 1 : 0.788
Unit Cell V:
3,398.16 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
From Type Description.

Type Occurrence of HorákiteHide

Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the National Museum in Prague, Czech Republic, catalogue number no. P1P 17/2017, and the Natural History Museum of Los Angeles County, Los Angeles, CA, USA, catalogue number 66575

Synonyms of HorákiteHide

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 HorákiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Plášil, J., Kampf, A.R., Sejkora, J., Škoda, R. and Tvrdý, J. (2017) Horákite, IMA 2017-033. CNMNC Newsletter No. 38, August 2017, page 1036; Mineralogical Magazine: 81: 1033–1038.

Internet Links for HorákiteHide

Localities for HorákiteHide

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
    • Krušné Hory Mts (Erzgebirge)
      • Jáchymov District (St Joachimsthal)
        • Jáchymov (St Joachimsthal)
Plášil, J., Kampf, A.R., Sejkora, J., Škoda, R. and Tvrdý, J. (2017) Horákite, IMA 2017-033. CNMNC Newsletter No. 38, August 2017, page 1036; Mineralogical Magazine: 81: 1033–1038.
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