marrite
Sign in to saveMarrite (mar'-ite) is a mineral with the chemical formula PbAgAsS3. It is the arsenic equivalent of freieslebenite (PbAgSbS3), but also displays close polyhedral characteristics with sicherite and diaphorite. Marrite was first described in 1905, and was named in honor of geologist John Edward Marr (1857–1933) of Cambridge, England.
Wikidata facts
- Subclass of
- sulfosalt subclass of minerals
- Named after
- John Edward Marr
- Image
- Galena-Marrite-rar09-mf04b.jpg
Show 8 more facts
- Nickel-Strunz 9th edition (updated 2009)
- 2.JB.15
- Commons category
- Marrite
- chemical formula
- AgPbAsS₃
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 2.JB.15
- type locality (geology)
- Lengenbach quarry
- crystal system
- monoclinic crystal system
- IMA Mineral Symbol
- Mrr
- Strunz 8th edition (series ID, updated)
- II/D.05c
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Encyclopedic overview
4 sectionsContents
- Crystal habit
- Optical mineralogy
- Occurrence
- References
Marrite (mar'-ite) is a mineral with the chemical formula PbAgAsS3. It is the arsenic equivalent of freieslebenite (PbAgSbS3), but also displays close polyhedral characteristics with sicherite and diaphorite. Marrite was first described in 1905, and was named in honor of geologist John Edward Marr (1857–1933) of Cambridge, England.
==Crystal habit== Marrite is part of the monoclinic crystal class, and 2⁄m point group. The symmetry reveals that this mineral is composed of 3 axes of unequal lengths. Two of the axes are perpendicular at 90 degrees, while one axis intersects at an angle less than 90 degrees. Crystal habit includes striated, meaning it forms parallel lines along crystal faces; or tabular, meaning that structure dimensions are thin in 1 direction.
Excerpted from Wikipedia’s “marrite” article, available under the CC BY-SA 4.0 licence.