fornacite
Sign in to saveFornacite is a rare lead, copper chromate arsenate hydroxide mineral with the formula: Pb2Cu(CrO4)(AsO4)(OH). It forms a series with the phosphate mineral vauquelinite. It forms variably green to yellow, translucent to transparent crystals in the monoclinic – prismatic crystal system. It has a Mohs hardness of 2.3 and a specific gravity of 6.27.
Key facts
- Mineral.name
- Fornacite
- Mineral.image
- Dioptasereneville2.jpg
- Mineral.imagesize
- 260px
- Mineral.caption
- Dioptase (blue green), cerussite (light pink) and fornacite (green) from Renéville, Djoué, Brazzaville Region, Republic of Congo
- Mineral.category
- Arsenate mineral
- Mineral.formula
- Pb2Cu(CrO4)(AsO4)(OH)
- Mineral.IMAsymbol
- For
- Mineral.strunz
- 7.FC.10
- Mineral.dana
- 43.4.3.2
- Mineral.system
- Monoclinic
- Mineral.class
- Prismatic (2/m) (same H-M symbol)
- Mineral.symmetry
- P21/c
- Mineral.unit cell
- a = 8.101(2), b = 5.893(11), c = 17.547(9) [Å]; β = 110.00(4)°; Z = 4
- Mineral.color
- Deep olive-green
- Mineral.habit
- Aggregates of steep pyramidal to bladed, rounded crystals
- Mineral.fracture
- Irregular/uneven, conchoidal, sub-conchoidal
- Mineral.tenacity
- Brittle
- Mineral.mohs
- 2–3
via Wikipedia infobox
Wikidata facts
- Image
- Fornacite.jpg
Show 8 more facts
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 7.FC.10
- Nickel-Strunz 9th edition (updated 2009)
- 7.FC.10
- Commons category
- Fornacite
- IMA Mineral Symbol
- For
- Mohs' hardness
- 2.5
- density
- 6.27
- chemical formula
- CuPb₂(CrO₄)(AsO₄)(OH)
- Strunz 8th edition (series ID, updated)
- VI/E.02
Sources (1)
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Article
1 sectionsContents
- References
Fornacite is a rare lead, copper chromate arsenate hydroxide mineral with the formula: Pb2Cu(CrO4)(AsO4)(OH). It forms a series with the phosphate mineral vauquelinite. It forms variably green to yellow, translucent to transparent crystals in the monoclinic – prismatic crystal system. It has a Mohs hardness of 2.3 and a specific gravity of 6.27.
It was first described in 1915 and named after Lucien Lewis Forneau (1867–1930) the governor of the French Congo. Its type locality is in Reneville, Republic of Congo.