Metavariscite Mineral Data

Metavariscite Mineral Data +

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General Metavariscite Information

Chemical Formula:

AlPO4·2(H2O)

Composition:

Molecular Weight = 157.98 gm

Aluminum 17.08 % Al 32.27 % Al₂O₃

Phosphorus 19.61 % P 44.92 % P₂O₅

Hydrogen 2.55 % H 22.81 % H₂O

Oxygen 60.76 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al(PO₄)·2(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1925

Locality:

Edison-Bird mine, Utahlite Hill, Lucin, Box Elder Co., Utah, USA. Link to MinDat.org Location Data.

Name Origin:

Named for its dimorphic relationship to variscite.

Synonym:

ICSD 2643

PDF 33-32

Metavariscite Image

Images:

Metavariscite

Comments: Clear tabular crystals of metavariscite.
Location: Utahlite claim, Lucin, Box Elder County, Utah, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Metavariscite Crystallography

Axial Ratios:

a:b:c =0.5448:1:0.8885

Cell Dimensions:

a = 5.182, b = 9.5115, c = 8.4516, Z = 4; beta = 90.4° V = 416.56 Den(Calc)= 2.52

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 4.758(1), 2.705(0.95), 4.227(0.65),

Forms:

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Forms: [ 0 1 0] [ 1 1 0] [ 1 3 0] [ 0 1 1]

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Crystal Structure:

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Kniep R , Mootz D , Acta Crystallographica, Section B , 29 (1973) p.2292-2294, Metavariscite - A redetermination of its crystal structure, Locality: Utalith Hill, Lucin, Utah, USA

Physical Properties of Metavariscite

Cleavage:

[010] Good

Color:

Light green.

Density:

2.54

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Metavariscite

Gladstone-Dale:

CI meas= 0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2237,KPDmeas= 0.2219,KC= 0.2266

Optical Data:

Biaxial (+), a=1.551, b=1.558, g=1.582, bire=0.0310, 2V(Calc)=58, 2V(Meas)=55.

Calculated Properties of Metavariscite

Electron Density:

r_electron=2.55 gm/cc
note: r_{Metavariscite}=2.52 gm/cc.

Fermion Index

Fermion Index = 0.00029
Boson Index = 0.99971

Photoelectric:

PE_{Metavariscite}= 1.49 barns/electron
U=PE_{Metavariscite} x r_electron= 3.79 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Metavariscite is Not Radioactive

Metavariscite Classification

Dana Class:

40.4.3.1 (40)Hydrated Phosphates, etc

(40.4)where A+++ XO4 · x(H2O)

(40.4.3)Dana Group

40.4.3.1 Metavariscite AlPO4·2(H2O) P 2₁/n 2/m

40.4.3.2 Phosphosiderite FePO4·2(H2O) P 2₁/n 2/m

40.4.3.3 Kolbeckite ScPO4·2(H2O) P 2₁2₁2₁ 2 2 2

Strunz Class:

VII/C.09-10 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.09 - Variscite group

VII/C.09-10 Metavariscite AlPO4·2(H2O) P 2₁/n 2/m

VII/C.09-20 Phosphosiderite FePO4·2(H2O) P 2₁/n 2/m

VII/C.09-30 Kolbeckite ScPO4·2(H2O) P 2₁2₁2₁ 2 2 2

VII/C.09-35 Malhmoodite FeZr(PO4)2·4(H2O) P 2₁/c 2/m

VII/C.09-50 Variscite AlPO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-60 Strengite FePO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-70 Mansfieldite AlAsO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-80 Scorodite FeAsO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-85 Yanomamite In(AsO4)·2(H2O) P bca 2/m 2/m 2/m

VII/C.09-88 Parascorodite! FeAsO4·2(H2O) HEX ? Hex

VII/C.09-90 Koninckite FePO4·3(H2O)(?) Unk Tetra

Other Metavariscite Information

References:

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

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Metavariscite

AlPO4·2(H2O)
Dana No: 40.4.3.1 Strunz No: VII/C.09-10
Locality:

Notes: