Pahasapaite Mineral Data (original) (raw)

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

Click Here for Larger Pahasapaite Image in a New Browser Window Images:

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 - TetartoidalH-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),

Click Here for Large Pahasapaite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
I - Data Info
A - Atoms On/Off
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B - Bonds On/Off
Help on Above

| | Rouse R C , Peacor D R , Merlino S , American Mineralogist , 74 (1989) p.1195-1202, Crystal structure of pahasapaite, a beryllophosphate mineral with a distorted, zeolite rho framework | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

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:

40.05.07.01 (40)Hydrated Phosphates, etc

(40.05)with miscellaneous formulae

(40.05.07)Dana Group

40.05.07.01 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
15 - WWW-MINCRYST

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Ask about Pahasapaite here :
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Print or Cut-and-Paste your Pahasapaite Specimen Label here :

Pahasapaite

Li8(Ca,Li,K,Na)11Be24(PO4)24•38(H2O)
Dana No: 40.05.07.01 Strunz No: 08.CA.25
Locality:

Notes: