Chlorellestadite

Formula:  Ca5(SiO4,PO4,SO4)3(Cl,F)

Origin of name:  For Reuben Ellestad, American chemist

 

Crystal system:  Hexagonal

Crystal class:  6/m

Twinning:

Unit cell:

 

Colour:  Pale rose, pink, orange

Diaphaneity:  Translucent

Luster:  Vitreous

Habit:

Hardness:  5

Specific gravity:  3.07

Cleavage:  None

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:  Series with fluorellestadite and with hydroxyellestadite

 

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