Cadmoselite

Formula:  CdSe

Origin of name:  From composition

 

Crystal system:  Hexagonal

Crystal class:  6mm

Twinning:

Unit cell: a = 4.271 Å, c = 6.969 Å

 

Colour:  Black

Diaphaneity: Opaque

Luster:  Resinous to adamantine

Habit:  Crystals minute, with hexagonal pyramid and base, horizontal striations

Hardness:  4

Specific gravity:  5.663

Cleavage:  1l perfect prismatic

Tenacity: Brittle

Streak:  Black

 

Synonyms/varieties:

 

Comments: Found in sedimentary strata, under reducing secondary conditions of medium to high alkalinity

 

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