Rilandite Mineral Data

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General Rilandite Information

Chemical Formula:

(Cr,Al)6SiO11•5(H2O) (?)

Composition:

Molecular Weight = 568.61 gm

Aluminum 7.12 % Al 13.45 % Al₂O₃

Chromium 41.15 % Cr 60.14 % Cr₂O₃

Silicon 4.94 % Si 10.57 % SiO₂

Hydrogen 1.77 % H 15.84 % H₂O

Oxygen 45.02 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cr_4.5Al_1.5SiO₁₁•5(H₂O)

Environment:

Sandstone-hosted uranium-vanadium deposits. Needs further study.

IMA Status:

Valid Species (Pre-IMA) 1933

Locality:

Carnotite claims 20 km ENE fo Meeker, Colorado, USA. Link to MinDat.org Location Data.

Name Origin:

Named for James L. Riland (1857-1938?), newspaper publisher of Meeker, Colorado, on whose claim the mineral was found.

Rilandite Image

Images:

Rilandite

Comments: Dark brown opaque resinous rilandite cleavage fragment.
Location: J. L. Riland Claim, near Meeker, Rio Blanco County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Rilandite Crystallography

Crystal System:

MonoclinicSpace Group: Mono ?

Physical Properties of Rilandite

Color:

Black.

Diaphaneity:

Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2-3 - Gypsum-Calcite

Luster:

Resinous

Streak:

grayish brown

Optical Properties of Rilandite

Optical Data:

Calculated Properties of Rilandite

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Rilandite= 9.54 barns/electron
U=PE_Rilandite x rElectron Density= . barns/cc.

Radioactivity:

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

Rilandite Classification

Dana Class:

07.11.14.01 (07)Multiple Oxides

(07.11)as titano-oxides with [4] and [6] substitutions

(07.11.14)Dana Group

07.11.14.01 Rilandite (Cr,Al)6SiO11•5(H2O)(?) Mono ? Mono

Strunz Class:

09.HB.10 09 - SILICATES (Germanates)

09.H - Unclassified Silicates

09.HB -With Ti, V, Cr

09.HB.10 Rilandite (Cr,Al)6SiO11•5(H2O)(?) Mono ? Mono

Other Rilandite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8)

See Also:

Links to other databases for Rilandite :
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

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Ask about Rilandite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
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Print or Cut-and-Paste your Rilandite Specimen Label here :

Rilandite

(Cr,Al)6SiO11•5(H2O) (?)
Dana No: 07.11.14.01 Strunz No: 09.HB.10
Locality:

Notes: