Mineralogy Database

Pahasapaite Mineral Data

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General Pahasapaite Information

Help on Chemical  Formula: Chemical Formula: Li8(Ca,Li,K,Na)11Be24(PO4)24•38(H2O)
Help on Composition: Composition: Molecular Weight = 3,532.65 gm
   Potassium    1.33 %  K     1.60 % K2O
   Sodium       0.13 %  Na    0.18 % Na2O
   Lithium      2.28 %  Li    4.91 % Li2O
   Calcium      6.24 %  Ca    8.73 % CaO
   Beryllium    6.12 %  Be   16.99 % BeO
   Phosphorus  21.04 %  P    48.22 % P2O5
   Hydrogen     2.17 %  H    19.38 % H2O
   Oxygen      60.69 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Li8Ca5.5Li3.6K1.2Na0.2Be24(PO4)24•38(H2O)
Help on Environment: Environment: late-stage mineral in seams in fractured beryl crystals in a complex granite pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: Tip Top mine, 8.5 km southwest of Custer, Custer County, South Dakota, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From Pahasapa, the Lakota Sioux word for Black Hills, South Dakota, USA.
Help on Name Pronunciation: Name Pronunciation: Pahasapaite + Pronunciation Say PAHASAPAITE
Help on Synonym: Synonym: ICSD 71430
  PDF 41-1384

Pahasapaite Image

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Comments: Lilac colored pahasapaite in matrix.
Location: Tip Top Mine, Fourmile, Custer District, Custer Co., South Dakota, USA. Scale: Picture size 3.5 mm.
© Thomas Witzke / Abraxas-Verlag

Pahasapaite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 13.781, Z = 1; V = 2,617.23 Den(Calc)= 2.24
Help on Crystal System: Crystal System: Isometric - Tetartoidal H-M Symbol (2 3) Space Group: I 23
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.6(1), 3.248(0.9), 3.684(0.9),

Physical Properties of Pahasapaite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, Yellow green, Light pink.
Help on Density: Density: 2.28
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Pahasapaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2335,KPDmeas= 0.2294,KC= 0.2318
Ncalc = 1.52 - 1.53
Help on Optical Data: Optical Data: Isotropic, n=1.523.

Calculated Properties of Pahasapaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.25 gm/cc
note: Specific Gravity of Pahasapaite =2.24 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEPahasapaite = 2.02 barns/electron
U=PEPahasapaite x relectron= 4.54 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 19.22 (Gamma Ray American Petroleum Institute Units)
Concentration of Pahasapaite per GRapi unit = 5.20 (%)

Estimated Radioactivity from Pahasapaite - barely detectable


Pahasapaite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.05)with miscellaneous formulae
  (40.05.07)Dana Group Pahasapaite Li8(Ca,Li,K,Na)11Be24(PO4)24•38(H2O) I 23 2 3
Help on  Strunz Class: Strunz Class: 08.CA.25 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CA -With small and large/medium cations
08.CA.25 Pahasapaite Li8(Ca,Li,K,Na)11Be24(PO4)24•38(H2O) I 23 2 3

Other Pahasapaite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Pahasapaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.CA.25





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