Ferristilpnomelane
A variety of Stilpnomelane
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About Ferristilpnomelane
Formula:
K(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27
Colour:
Greenish brown to dark greenish brown or black
Lustre:
Sub-Vitreous, Greasy
Hardness:
3 - 3½
Name:
Informally named in 1951 by Alexander N. Winchell for a slightly ferrian stilpnomelane, but sometimes mistaken as an attempt to rename ferric-dominant stilpnomelane (chalcodite).
This page provides mineralogical data about Ferristilpnomelane.
Unique Identifiers
Mindat ID:
10587 (as Ferristilpnomelane)
3789 (as Stilpnomelane)
3789 (as Stilpnomelane)
Long-form identifier:
mindat:1:1:10587:9 (as Ferristilpnomelane)
mindat:1:1:3789:7 (as Stilpnomelane)
mindat:1:1:3789:7 (as Stilpnomelane)
Similar Names
| Ferrostilpnomelane | A variety of Stilpnomelane | (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O |
Physical Properties of Ferristilpnomelane
Sub-Vitreous, Greasy
Transparency:
Transparent, Translucent
Colour:
Greenish brown to dark greenish brown or black
Streak:
Dark greenish brown
Hardness:
3 - 3½ on Mohs scale
Tenacity:
Flexible
Cleavage:
Perfect
{001}
{001}
Fracture:
Micaceous
Chemistry of Ferristilpnomelane
Mindat Formula:
K(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27
Element Weights:
Common Associates
Associations Based on Photo Data:
| 7 photos of Ferristilpnomelane associated with Willemite | Zn2SiO4 |
| 7 photos of Ferristilpnomelane associated with Franklinite | Zn2+Fe3+2O4 |
| 7 photos of Ferristilpnomelane associated with 'Chalcodite' | K(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27 |
| 4 photos of Ferristilpnomelane associated with Magnesio-riebeckite | ◻{Na2}{Mg3Fe3+2}(Si8O22)(OH)2 |
| 4 photos of Ferristilpnomelane associated with Calcite | CaCO3 |
| 4 photos of Ferristilpnomelane associated with Quartz | SiO2 |
| 1 photo of Ferristilpnomelane associated with Ferriallanite-(Ce) | (CaCe)(Fe3+AlFe2+)O[Si2O7][SiO4](OH) |
| 1 photo of Ferristilpnomelane associated with Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Radioactivity
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 Ferristilpnomelane
mindat.org URL:
https://www.mindat.org/min-10587.html
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References for Ferristilpnomelane
Localities for Ferristilpnomelane
Showing 7 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Poland | |
| Lis et al. (1986) |
Tajikistan | |
| V.A. Karpenko data |
USA | |
| Chesterman (1966b) +3 other references |
| Eckel et al. (1997) |
| Dunn (1995) +1 other reference |
| Oen et al. (1984) | |
| Robinson et al. (1984) |
Franklin Mine, Franklin, Sussex County, New Jersey, USA