Rilandite
A valid IMA mineral species - grandfathered - questionable
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About Rilandite
Formula:
Cr6SiO11 · 5H2O (?)
Also given as Cr4Al2SiO11 · 5H2O or near.
Colour:
dark brownish black
Lustre:
Dull
Hardness:
2 - 3
Name:
Named after James L. Riland (May 5, 1857 Pine Grove, Pennsylvania, USA - October 15, 1936 Meeker Colorado, USA) newspaper publisher and miner of Meeker, Colorado, USA.
This page provides mineralogical data about Rilandite.
Unique Identifiers
Mindat ID:
3419
Long-form identifier:
mindat:1:1:3419:3
GUID
(UUID V4):
(UUID V4):
50ceb4bd-662e-4697-a897-491df9b030db
IMA Classification of Rilandite
Approved, 'Grandfathered' (first described prior to 1959), Questionable
Classification of Rilandite
9.HB.10
9 : SILICATES (Germanates)
H : Unclassified silicates
B : With Ti, V, Cr
9 : SILICATES (Germanates)
H : Unclassified silicates
B : With Ti, V, Cr
7.11.14.1
7 : MULTIPLE OXIDES
11 : Miscellaneous
7 : MULTIPLE OXIDES
11 : Miscellaneous
16.15.4
16 : Silicates Containing Aluminum and other Metals
15 : Aluminosilicates of V and Cr
16 : Silicates Containing Aluminum and other Metals
15 : Aluminosilicates of V and Cr
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Ril | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Rilandite
Dull
Transparency:
Translucent
Comment:
Brilliant on fresh surface, otherwise dull, pitchy
Colour:
dark brownish black
Streak:
grayish brown
Hardness:
2 - 3 on Mohs scale
Tenacity:
Brittle
Fracture:
Conchoidal
Chemistry of Rilandite
Mindat Formula:
Cr6SiO11 · 5H2O (?)
Also given as Cr4Al2SiO11 · 5H2O or near.
Also given as Cr4Al2SiO11 · 5H2O or near.
Elements listed:
Common Impurities:
Fe,Mg,Ca
Crystallography of Rilandite
Morphology:
Subhedral, angular and platy; compact, massive.
Comment:
Crystal Data: n.d. Point Group: n.d.; Space Group: n.d. Z = n.d.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47e : [Vanadates, chromates, manganates] | |
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
53 : Other minerals with taphonomic origins | <0.4 |
Type Occurrence of Rilandite
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 96808.
Associated Minerals at Type Locality:
Reference:
Henderson E P, Hess F L (1933) Corvusite and rilandite, new minerals from the Utah-Colorado carnotite region. American Mineralogist 18, 195-205
Other Language Names for Rilandite
Related Minerals - Strunz-mindat Grouping
9.HB. | Waipouaite | Ca3V4+5O9[Si2O5(OH)2][Si3O7(OH)2] · 11H2O |
9.HB.05 | Ilmajokite-(Ce) | Na11KBaCe2Ti12Si37.5O94(OH)31 · 29H2O |
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.
Internet Links for Rilandite
mindat.org URL:
https://www.mindat.org/min-3419.html
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Please feel free to link to this page.
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References for Rilandite
Localities for Rilandite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
USA (TL) | |
| Eckel et al. (1997) |
Riland uranium claim, Meeker, Rio Blanco County, Colorado, USA