Roepperite (of Brush)
A variety of Fayalite
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Formula:
(Fe2+,Mn,Zn)2SiO4
Colour:
Black, greenish black, rarely dark yellow green
Lustre:
Sub-Vitreous, Resinous, Greasy, Dull
Hardness:
5½ - 6
Specific Gravity:
3.95 - 4.08
Name:
Named in 1872 by George J. Brush in honor of William Theodore Roepper [March 7, 1810 Peilau, Lower Silesia, Germany [now Poland] - March 11, 1880 Bethlehem, Pennsylvania, USA] professor of mineralogy and geology and curator of mineralogy at Lehigh University, Bethlehem, Pennsylvania, USA, noted researcher of Franklin-Ogdensburg, New Jersey minerals and who first described the species. Roepper also discovered the zinc deposits in the Saucon Valley of Pennsylvania.
A variety of Fayalite
A manganoan, zincian fayalite. Black slightly rounded to very rounded crystals, also black cleavages.
A manganoan, zincian fayalite. Black slightly rounded to very rounded crystals, also black cleavages.
Unique Identifiers
Mindat ID:
43736 (as Roepperite (of Brush))
1458 (as Fayalite)
1458 (as Fayalite)
Long-form identifier:
mindat:1:1:43736:1 (as Roepperite (of Brush))
mindat:1:1:1458:4 (as Fayalite)
mindat:1:1:1458:4 (as Fayalite)
GUID
(UUID V4):
(UUID V4):
09ea7a2f-50bb-4028-a3c7-ec39ba85efd5 (as Roepperite (of Brush))
62cc2922-7db2-4c95-8aa5-04e2c6a24ca4 (as Fayalite)
62cc2922-7db2-4c95-8aa5-04e2c6a24ca4 (as Fayalite)
Physical Properties of Roepperite (of Brush)
Sub-Vitreous, Resinous, Greasy, Dull
Transparency:
Translucent, Opaque
Colour:
Black, greenish black, rarely dark yellow green
Hardness:
5½ - 6 on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Very Good
{010}
{010}
Density:
3.95 - 4.08 g/cm3 (Measured)
Chemistry of Roepperite (of Brush)
Mindat Formula:
(Fe2+,Mn,Zn)2SiO4
Common Associates
Associated Minerals Based on Photo Data:
Fluorescence of Roepperite (of Brush)
Not fluorescent in UV
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 Roepperite (of Brush)
mindat.org URL:
https://www.mindat.org/min-43736.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Roepperite (of Brush)
Reference List:
Localities for Roepperite (of Brush)
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 | |
| Dana (1892) |
www.mineralman.com (n.d.) +1 other reference | |
| Dana et al. (1892) |