Georgerobinsonite
Hydrous chromate mineral / From Wikipedia, the free encyclopedia
Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about Georgerobinsonite?
Summarize this article for a 10 year old
SHOW ALL QUESTIONS
Georgerobinsonite, named for George Willard Robinson,[4] is a lead chromate mineral with formula Pb4(CrO4)2(OH)2FCl.[2] It exhibits very small, transparent crystals with a bright orange-red color.[2][5] It was obtained from the Mammoth–St. Anthony Mine in Arizona in the 1940s and identified in 2009.
Quick Facts General, Category ...
Georgerobinsonite | |
---|---|
General | |
Category | Mineral |
Formula (repeating unit) | Pb4(CrO4)2(OH)2FCl |
IMA symbol | Grb[1] |
Crystal system | Orthorhombic[2] |
Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
Space group | Pmmn |
Unit cell | a = 7.6257(6) b = 11.6078(9) c = 6.8961(5) [Å]; Z = 2[3] |
Identification | |
Color | Orange-red |
Cleavage | None[2] |
Fracture | Uneven[2] |
Mohs scale hardness | 2.5–3[2] |
Luster | Adamantine luster |
Streak | Pale orange |
Density | 6.23 g/cm3 (calculated)[2] |
Ultraviolet fluorescence | None[2] |
Close