Paracostibite

Formula: CaSbS

Origin of name: from Greek para = similar and costibite

 

Crystal system: orthorhombic

Crystal class: mm2

Twinning: 

Unit cell: 

 

Colour: in reflected light white with faint grayish tint

Diaphaneity: opaque

Luster: metallic

Habit: irregular and subhedral grains, to 130 micron

Hardness: 6.5

Specific gravity: 6.9 to 7.1

Cleavage: none

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: dimorphous with costibite

 

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