Chladniite

Formula:  Na₂CaMg₇(PO₄)₆

Origin of name:  For Ernst F. F. Chladni, Latvian scientist

Crystal system:  Hexagonal

Crystal class:  -3

Twinning: 

Unit cell:

Colour:  Colourless

Diaphaneity:  Transparent

Luster:

Habit:  A single grain

Hardness:  6

Specific gravity:  3.01

Cleavage:  1; Rhomboidal (rare)

Tenacity:

Streak:

Synonyms/varieties:

Comments:  Mg analogue of fillowite and johnsomervilleite; from an iron meteorite