Hannayite

Formula:  (NH4)2Mg3H4(PO4)4 . 8H2O

Origin of name:  For J. Hannay, British chemist

 

Crystal system:  Triclinic

Crystal class:  -1

Twinning:

Unit cell:

 

Colour: Yellowish

Diaphaneity:  Transparent

Luster:  Vitreous

Habit:  Crystals thin prismatic, striated and elongated parallel to c-axis, small

Hardness:  1

Specific gravity:  2.03

Cleavage:  4; {001} perfect, {110}, {1-10}, and {130} poor

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:

 

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