Ehrleite Mineral Data

Ehrleite Mineral Data +

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General Ehrleite Information

Chemical Formula:

Ca2ZnBe(PO4)2(PO3,OH)·4(H2O)

Composition:

Molecular Weight = 480.04 gm

Calcium 16.70 % Ca 23.36 % CaO

Beryllium 1.88 % Be 5.21 % BeO

Zinc 13.62 % Zn 16.95 % ZnO

Phosphorus 17.74 % P 40.66 % P₂O₅

Hydrogen 1.73 % H 15.48 % H₂O

Oxygen 48.33 % O

______ ______

100.00 % 101.67 % = TOTAL OXIDE

Empirical Formula:

Ca₂ZnBe(PO₄)₂(PO₃)_0.75(OH)_0.25·4(H₂O)

IMA Status:

Approved IMA 1985

Locality:

Tip Top mine, Custer County, South Dakota. Link to MinDat.org Location Data.

Name Origin:

Named for Howard Ehrle of Miles City, Montana, who found the mineral.

Synonym:

ICSD 202481

PDF 38-402

Ehrleite Image

Images:

Ehrleite Parascholzite

Comments: White to clear, slender, 1-2mm, prismatic crystals of ehrleite associated with massive parascholzite. Type specimen courtesy of Museum of Geology, SD School of Mines.
Location: Tip Top mine, Custer County, South Dakota, USA. Scale: Crystal size 1-2 mm.
© Tom Loomis / Dakota Matrix

Ehrleite Crystallography

Axial Ratios:

a:b:c =0.9596:1:1.6795

Cell Dimensions:

a = 7.13, b = 7.43, c = 12.479, Z = 2; alpha = 94.31°, beta = 102.07°, gamma = 82.65° V = 639.35 Den(Calc)= 2.49

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.16(1), 12.41(0.7), 2.723(0.6),

Crystal Structure:

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Hawthorne F C , Grice J D , The Canadian Mineralogist , 25 (1987) p.767-774, The crystal structure of ehrleite, a tetrahedral sheet structure

Physical Properties of Ehrleite

Cleavage:

[???] Indistinct

Color:

Colorless, White.

Density:

2.64

Diaphaniety:

Transparent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Ehrleite

Gladstone-Dale:

CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.054 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.227,KPDmeas= 0.2141,KC= 0.2154

Optical Data:

Biaxial (+), a=1.556, b=1.56, g=1.58, bire=0.0240, 2V(Calc)=50, 2V(Meas)=62.

Calculated Properties of Ehrleite

Electron Density:

r_electron=2.63 gm/cc
note: r_Ehrleite=2.64 gm/cc.

Fermion Index

Fermion Index = 0.02481
Boson Index = 0.97519

Photoelectric:

PE_Ehrleite= 9.48 barns/electron
U=PE_Ehrleite x r_electron= 24.97 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ehrleite is Not Radioactive

Ehrleite Classification

Dana Class:

40.5.6.1 (40)Hydrated Phosphates, etc

(40.5)with miscellaneous formulae

(40.5.6)Dana Group

40.5.6.1 Ehrleite Ca2ZnBe(PO4)2(PO3,OH)·4(H2O) P1 1

Strunz Class:

VII/C.03-20 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.03 - Fransoletite - Ehrleite series

VII/C.03-10 Fransoletite H2Ca3Be2(PO4)4·4(H2O) P 2₁/a 2/m

VII/C.03-15 Parafransoletite Ca3Be2(PO4)2(PO3,OH)2·4(H2O) P1 1

VII/C.03-20 Ehrleite Ca2ZnBe(PO4)2(PO3,OH)·4(H2O) P1 1

Other Ehrleite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Ehrleite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Print or Cut-and-Paste your Ehrleite Specimen Label here :

Ehrleite

Ca2ZnBe(PO4)2(PO3,OH)·4(H2O)
Dana No: 40.5.6.1 Strunz No: VII/C.03-20
Locality:

Notes: