Vuagnatite Mineral Data

Vuagnatite Mineral Data +

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General Vuagnatite Information

Chemical Formula:

CaAlSiO4(OH)

Composition:

Molecular Weight = 176.15 gm

Calcium 22.75 % Ca 31.84 % CaO

Aluminum 15.32 % Al 28.94 % Al₂O₃

Silicon 15.94 % Si 34.11 % SiO₂

Hydrogen 0.57 % H 5.11 % H₂O

Oxygen 45.41 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaAl(SiO₄)(OH)

IMA Status:

Approved IMA 1976

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 12127

PDF 29-289

Vuagnatite Image

Images:

Vuagnatite Mcguinnessite

Comments: Translucent colorless vuagnatite microcrystals with mcguinnessite.
Location: Near Red Mountain, Mendocino County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Vuagnatite Crystallography

Axial Ratios:

a:b:c =0.8259:1:0.6653

Cell Dimensions:

a = 7.055, b = 8.542, c = 5.683, Z = 4; V = 342.48 Den(Calc)= 3.42

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

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

By Intensity(I/I_o): 2.993(1), 2.635(0.7), 2.517(0.6),

Crystal Structure:

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McNear E , Vincent M G , Parthe E , American Mineralogist , 61 (1976) p.831-838, The crystal structure of vuagnatite, CaAl(OH)SiO4

Physical Properties of Vuagnatite

Cleavage:

[???] Perfect

Color:

Colorless, White, Light pink.

Density:

3.2 - 3.25, Average = 3.22

Diaphaniety:

Transparent to Translucent

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Vuagnatite

Gladstone-Dale:

CI meas= -0.036 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.21,KPDmeas= 0.2227,KC= 0.2151

Optical Data:

Biaxial (-), a=1.7, b=1.725, g=1.73, bire=0.0300, 2V(Calc)=46, 2V(Meas)=48.

Calculated Properties of Vuagnatite

Electron Density:

r_electron=3.42 gm/cc
note: r_Vuagnatite=3.42 gm/cc.

Fermion Index

Fermion Index = 0.00797
Boson Index = 0.99203

Photoelectric:

PE_Vuagnatite= 3.86 barns/electron
U=PE_Vuagnatite x r_electron= 13.17 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Vuagnatite is Not Radioactive

Vuagnatite Classification

Dana Class:

52.4.2.2 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.4)with cations in [6] and/or > [6] coordination

(52.4.2)Vuagnatite group

52.4.2.1 Mozartite CaMnSiO4(OH) P 2₁2₁2₁ 2 2 2

52.4.2.2 Vuagnatite CaAlSiO4(OH) P 2₁2₁2₁ 2 2 2

Strunz Class:

VIII/B.23-10 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.23 - Vuagnatite - Chantalite series

VIII/B.23-10 Vuagnatite CaAlSiO4(OH) P 2₁2₁2₁ 2 2 2

VIII/B.23-15 Mozartite CaMnSiO4(OH) P 2₁2₁2₁ 2 2 2

VIII/B.23-20 Chantalite CaAl2SiO4(OH)4 I 4₁/a 4/m

Other Vuagnatite Information

References:

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

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Vuagnatite

CaAlSiO4(OH)
Dana No: 52.4.2.2 Strunz No: VIII/B.23-10
Locality:

Notes: