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Cr63+SiO11 · 5H2O(?)
2 - 3
Named after James L. Riland, newspaper publisher of Meeker, Colorado, USA.
This page provides mineralogical data about Rilandite.

Classification of Rilandite

Approved, 'Grandfathered' (first described prior to 1959), Questionable

9 : SILICATES (Germanates)
H : Unclassified silicates
B : With Ti, V, Cr

11 : Miscellaneous

16 : Silicates Containing Aluminum and other Metals
15 : Aluminosilicates of V and Cr

Physical Properties of Rilandite

Hardness (Mohs):
2 - 3

Chemical Properties of Rilandite

IMA Formula:
Cr63+SiO11 · 5H2O(?)
Elements listed in formula:
Common Impurities:

Type Occurrence of Rilandite

Relationship of Rilandite to other Species

9.HB.05Ilmajokite(Na,Ce,Ba)10Ti5Si14O22(OH)44 · nH2O
16.15.5ShuiskiteCa2MgCr2(SiO4)(Si2O7)(OH)2 · H2O
16.15.6VolkonskoiteCa0.3(Cr,Mg)2(Si,Al)4O10(OH)2 · 4H2O

Other Names for Rilandite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Rilandite

Reference List:
American Mineralogist (1933): 18: 195-215.

Internet Links for Rilandite URL:
Please feel free to link to this page.

Localities for Rilandite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
  • Colorado
    • Rio Blanco Co.
      • Meeker
Minerals of Colorado (1997) Eckel, E. B.
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