Fransoletite

Formula:  Ca₃Be₂(PO₄)₂(PO₃OH)₂ ^. 4H₂O

Origin of name:  For André-Mathieu Fransolet, Belgian mineralogist

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell: a = 7.35 Ǻ, b = 15.07 Ǻ, c = 7.06 Ǻ, β = 96.4°

Colour:  Colourless to slightly whitish

Diaphaneity:

Luster:  Subvitreous

Habit:  Crystals tabular in arrowhead-shaped aggregates to 3 mm, tiny

Hardness:  3

Specific gravity:  2.56

Cleavage:  1; {010} imperfect, easy

Tenacity:  Irregular

Streak:

Synonyms/varieties:

Comments:  Dimorphous with parafransoletite