Mineral description : Greenockite

Green greenockite in fractures, from Lovisa, Sweden. (Size 7x4x3 cm)

Mineral class	Sulphides : Sphalerite - Wurtzite group
Chemical formula	CdS
Crystal system	Hexagonal
Habitus	Crystals as hexagonal pyramides, striations on pyramidal faces parallel to the base. Often as earthy coatings.
Cleavage	Distinct along {11/22}, {0001} imperfect, fracture conchoidal, brittle.
Hardness	3 - 3.5
Density	4.82
Color	Red, orange yellow to greenish.
Streak	Orange yellow to deep brownish red.
Luster	Adamantine to resinous, translucent to opaque.
Description
Occurance
Associates	Sphalerite, smithsonite, prehnite, various zeolites.
Notes	Soluble in hydrochloric acid giving off hydrogen sulfide gas. Named after Charles Murray Cathcart, Lord Greenock (1783-1859)
Localities	A rare mineral in scandinavia. Sweden : Lovisa mine, Storå, Västmanland. As thin yellowish green earthy fractures. Boliden, Västerbotten. Intakan, Årjäng, Värmland. Norra Kärr, Småland. Nysäter, Säffle, Värmland. Tunaberg, Södermanland. Norway : Nyseter, Grua. Dalegruben, south of Konnerudkollen. Glomsrudkollen, Modum. Other places around the Oslo region. As secondary minerals together with sphalerite. Finland : Pihtiputaan Ritovuoren. With galenite in quarts veins.

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