Olivenite

Olivenite is a copper arsenate mineral, formula Cu2AsO4OH. It crystallizes in the orthorhombic system, and is sometimes found in small brilliant crystals of simple prismatic habit terminated by domal faces. More commonly, it occurs as globular aggregates of acicular crystals, these fibrous forms often having a velvety lustre; sometimes it is lamellar in structure, or soft and earthy.
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Noun
1. rare green to black mineral consisting of hydrated copper arsenate that is found in copper deposits
(hypernym) mineral

(n.)
An olive-green mineral, a hydrous arseniate of copper; olive ore.
  

General Information:
 Chemical Formula:
Cu2AsO4(OH)
 Composition:
(Molecular Weight = 283.02 gm)
Copper 44.91 % Cu
Arsenic 26.47 % As
Hydrogen 0.36 % H 
Oxygen 28.27 % O 
 Empirical Formula:
Cu2(AsO4)(OH)
 Name Origin:
From the German olivernerz, literally "olive" ore, in allusion to its typical color.
Physical Properties:
 Cleavage:
[110] Indistinct, [010] Indistinct, [110] Indistinct
 Color:
olive green, yellowish brown, dirty white, blackish green, or liver brown.
 Density:
4.1 - 4.4, Average = 4.25
 Diaphaniety:
Subtransparent to translucent to opaque
 Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Reniform - "Kidney like" i n shape (e.g.. hematite).
 Hardness:
3 - Calcite
 Luminescence:
None.
 Luster:
Vitreous - Greasy
 Streak:
yellowish green
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Eng: olivenite
Urdu: زیتونی کج دھات ۔