Mineralogy Database

Rilandite Mineral Data

Search Webmineral :

General Rilandite Information

Help on Chemical  Formula: Chemical Formula: (Cr,Al)6SiO11•5(H2O) (?)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Cr4.5Al1.5SiO11•5(H2O)
Help on Environment: Environment: Sandstone-hosted uranium-vanadium deposits. Needs further study.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1933
Help on Locality: Locality: Carnotite claims 20 km ENE fo Meeker, Colorado, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for James L. Riland (1857-1938?), newspaper publisher of Meeker, Colorado, on whose claim the mineral was found.

Rilandite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


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

Help on Crystal System: Crystal System: Monoclinic Space Group: Mono ?

Physical Properties of Rilandite

Help on Color: Color: Black.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Resinous
Help on Streak: Streak: grayish brown

Optical Properties of Rilandite

Help on Optical Data: Optical Data:

Calculated Properties of Rilandite

Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PERilandite = 9.54 barns/electron
U=PERilandite x rElectron Density= . barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rilandite is Not Radioactive

Rilandite Classification

Help on  Dana Class: Dana Class: (07)Multiple Oxides
  (07.11)as titano-oxides with [4] and [6] substitutions
  (07.11.14)Dana Group Rilandite (Cr,Al)6SiO11•5(H2O)(?) Mono ? Mono
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8)
Help on See Also: 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:

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

Visit our Advertisers for Rilandite :

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.

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 Espa´┐Żol

Print or Cut-and-Paste your Rilandite Specimen Label here :


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