Chlorapatite

Formula: Ca₅(PO₄)₃Cl

Origin of name:  From composition, chlorine member of apatite group

Crystal system:  Monoclinic

Crystal class:  6/m

Twinning:

Unit cell:

Colour:  Pinkish white, pale yellow

Diaphaneity:  Transparent to translucent

Luster:  Vitreous

Habit:  Crystals short to long prismatic

Hardness:  5

Specific gravity:  3.1 to 3.2

Cleavage:  2; {0001] indistinct, {10-10} trance

Tenacity:

Streak:

Synonyms/varieties:

Comments:  Series with fluorapatite and with hydroxylapatite