pumpellyite

Also known as pumpellyite series, pumpellyite-(M) series

Pumpellyite is a group of closely related sorosilicate minerals: pumpellyite-(Mg): pumpellyite-(Fe2+): pumpellyite-(Fe3+): pumpellyite-(Mn2+): pumpellyite-(Al):

Key facts

Mineral.name: Pumpellyite
Mineral.image: Mineraly.sk - pumpellyit.jpg
Mineral.category: Sorosilicate
Mineral.IMAsymbol: Pmp
Mineral.strunz: 9.BG.20
Mineral.system: Monoclinic
Mineral.class: Prismatic (2/m) (same H-M symbol)
Mineral.symmetry: A2/m
Mineral.color: Olive green to bluish green
Mineral.cleavage: Good in two directions
Mineral.fracture: Uneven
Mineral.tenacity: Brittle
Mineral.mohs: 5.5-6
Mineral.luster: Vitreous, dull
Mineral.streak: White
Mineral.diaphaneity: Translucent
Mineral.gravity: 3.2

via Wikipedia infobox

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References

Pumpellyite is a group of closely related sorosilicate minerals: pumpellyite-(Mg): pumpellyite-(Fe2+): pumpellyite-(Fe3+): pumpellyite-(Mn2+): pumpellyite-(Al):

Pumpellyite crystallizes in the monoclinic-prismatic crystal system. It typically occurs as blue-green to olive green fibrous to lamellar masses. It is translucent and glassy with a Mohs hardness of 5.5 and a specific gravity of 3.2. It has refractive indices of nα=1.674–1.748, nβ=1.675–1.754 and nγ=1.688–1.764.

Excerpted from Wikipedia’s “pumpellyite” article, available under the CC BY-SA 4.0 licence.