Rilandite Mineral Data

Advertisment

Our Mission is Simple: RMS will be the go-to portal for all Mineral, Gem and Rock shows in the USA

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

Search for Rilandite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Rilandite :

Adam's Minerals Google Search for Rilandite
Dakota Matrix Minerals Google Search for Rilandite
John Betts Fine Minerals Search for Rilandite
McDougall Minerals Google Search for Rilandite
Rock and Mineral Shows Google Search for Rilandite
Tucson Mall Google Search for Rilandite
Weinrich Minerals, Inc. Google Search for Rilandite

Ask about Rilandite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: