Dietzeite Mineral Data

Dietzeite Mineral Data +

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General Dietzeite Information

Chemical Formula:

Ca2(IO3)2(CrO4)

Composition:

Molecular Weight = 545.96 gm

Calcium 14.68 % Ca 20.54 % CaO

Chromium 9.52 % Cr 18.32 % CrO₃

Iodine 46.49 % I 61.14 % I₂O₅

Oxygen 29.31 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂(IO₃)₂(CrO₄)

IMA Status:

Valid Species (Pre-IMA) 1894

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 75923

PDF 25-132

Dietzeite Image

Images:

Dietzeite

Comments: Yellow crystalline coating of dietzeite on matrix.
Location: Iquique, Tarapaca, Chile. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Dietzeite Crystallography

Axial Ratios:

a:b:c =1.3979:1:1.9294

Cell Dimensions:

a = 10.118, b = 7.238, c = 13.965, Z = 4; beta = 106.62° V = 979.99 Den(Calc)= 3.70

Crystal System:

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

Forms:

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Crystal Structure:

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Burns P C , Hawthorne F C , The Canadian Mineralogist , 31 (1993) p.313-319, The crystal structure of dietzeite, Ca2H20(IO3)2(CrO4), a heteropolyhedral, framework mineral

Physical Properties of Dietzeite

Cleavage:

[100] Indistinct

Color:

Golden yellow.

Density:

3.617

Diaphaniety:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Dietzeite

Gladstone-Dale:

CI meas= -0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2274,KPDmeas= 0.2326,KC= 0.2237

Optical Data:

Biaxial (-), a=1.825, b=1.842, g=1.857, bire=0.0320, 2V(Calc)=84, 2V(Meas)=86.

Calculated Properties of Dietzeite

Electron Density:

r_electron=3.39 gm/cc
note: r_Dietzeite=3.70 gm/cc.

Fermion Index

Fermion Index = 0.00938
Boson Index = 0.99062

Photoelectric:

PE_Dietzeite= 175.19 barns/electron
U=PE_Dietzeite x r_electron= 593.64 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Dietzeite is Not Radioactive

Dietzeite Classification

Dana Class:

23.1.1.1 (23)Compound Iodates

(23.1)with miscellaneous formulae

(23.1.1)Dana Group

23.1.1.1 Dietzeite Ca2(IO3)2(CrO4) P 2₁/c 2/m

Strunz Class:

IV/L.01-30 IV - Oxides

IV/L - Iodates with [IO3]1- groups

IV/L.01 - Lautarite - Dietzeite series

IV/L.01-10 Lautarite Ca(IO3)2 P 2₁/n 2/m

IV/L.01-20 Bruggenite Ca(IO3)2·(H2O) P 2₁/c 2/m

IV/L.01-30 Dietzeite Ca2(IO3)2(CrO4) P 2₁/c 2/m

Other Dietzeite Information

References:

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

See Also:

Links to other databases for Dietzeite :
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 Dietzeite Specimen Label here :

Dietzeite

Ca2(IO3)2(CrO4)
Dana No: 23.1.1.1 Strunz No: IV/L.01-30
Locality:

Notes: