Mendozite Mineral Data

General Mendozite Information

Chemical Formula:

NaAl(SO4)2•11(H2O)

Composition:

Molecular Weight = 440.27 gm

Sodium 5.22 % Na 7.04 % Na₂O

Aluminum 6.13 % Al 11.58 % Al₂O₃

Hydrogen 5.04 % H 45.01 % H₂O

Sulfur 14.57 % S 36.37 % SO₃

Oxygen 69.05 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaAl(SO₄)₂•11(H₂O)

Environment:

Oxidation of pyrite in reaction with clays,

IMA Status:

Valid Species (Pre-IMA) 1868

Locality:

"San Juan, near Mendoza" [probably meaning Mendoza Province; the original occurrence appears lost.], Argintina. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Mendozite + Pronunciation

Synonym:

ICSD 26005

PDF 22+475

Mendozite Image

Images:

Mendozite

Comments: White chalky massive mendozite.
Location: Gold Bottom Mine, Inyo County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mendozite Crystallography

Axial Ratios:

a:b:c =2.388:1:0.911

Cell Dimensions:

a = 21.75, b = 9.108, c = 8.298, Z = 4; beta = 92.47° V = 1,642.30 Den(Calc)= 1.78

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 3.5(1), 4.76(0.85), 4.58(0.65),

Physical Properties of Mendozite

Cleavage:

{100} Good, {001} Indistinct, {010} Indistinct

Color:

Colorless, White.

Density:

1.73 - 1.765, Average = 1.74

Diaphaneity:

Transparent to Translucent

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Mendozite

Gladstone-Dale:

CI meas= -0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2571,KPDmeas= 0.2619,KC= 0.2548
Ncalc = 1.44 - 1.45

Optical Data:

Biaxial (-), a=1.449, b=1.461, g=1.463, bire=0.0140, 2V(Calc)=44, 2V(Meas)=56.

Calculated Properties of Mendozite

Electron Density:

Bulk Density (Electron Density)=1.86 gm/cc
note: Specific Gravity of Mendozite =1.78 gm/cc.

Fermion Index:

Fermion Index = 0.0014314753
Boson Index = 0.9985685247

Photoelectric:

PE_Mendozite= 1.26 barns/electron
U=PE_Mendozite x rElectron Density= 2.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mendozite is Not Radioactive

Mendozite Classification

Dana Class:

29.05.04.01 (29)Hydrated Acid and Sulfates

(29.05)where A B (XO4)2 � x(H2O)

(29.05.04)Dana Group

29.05.04.01 Mendozite NaAl(SO4)2•11(H2O) C 2/c 2/m

29.05.04.02 Kalinite KAl(SO4)2•11(H2O) C 2/c 2/m

Strunz Class:

07.CC.15 07 - SULFATES (SELENATES, TELLURATES)

07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O

07.CC -With medium-sized and large cations

07.CC.15 Mendozite NaAl(SO4)2•11(H2O) C 2/c 2/m

07.CC.15 Kalinite KAl(SO4)2•11(H2O) C 2/c 2/m

Other Mendozite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Mendozite :
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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Print or Cut-and-Paste your Mendozite Specimen Label here :

Mendozite

NaAl(SO4)2•11(H2O)
Dana No: 29.05.04.01 Strunz No: 07.CC.15
Locality:

Notes:

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