Carboborite

Formula:  Ca₂Mg(CO₃)₂B₂(OH)₈ ^. 4H₂O

Origin of name:  From composition

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell:

Colour:  Colourless

Diaphaneity:

Luster:  Vitreous

Habit:  Crystals small, resemble steep rhombohedrons

Hardness:  2

Specific gravity:  2.12

Cleavage:  3; {100} perfect, {-111} distinct, {001} imperfect

Tenacity:

Streak:

Synonyms/varieties:

Comments:  Fluoresces white, phosphoresces pale green