Crawfordite

Formula:  Na3Sr(PO4)(CO3)

 

Origin of name:  For Aldair Crawford, Scottish physician and chemist

 

Crystal system:  Monoclinic

Crystal class:  2

Twinning:

Unit cell:

 

Colour:  Colourless

Diaphaneity:  Transparent to translucent

Luster:  Vitreous (dull)

Habit:  Irregular grains to 1mm

Hardness:  3

Specific gravity:  3.05

Cleavage:

Tenacity:

Streak:  White

 

Synonyms/varieties:

 

Comments:  Sr analogue of bradleyite, bonshtedite and sidorenkite; readily soluble in 10% HCl and in citric acid; fluoresces bright greenish yellow in UV light

 

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