Parasibirskite

Formula: Ca₂B₂O₅·(H₂O)

Origin of name: For it's relationship to sibirskite

Crystal system: Monoclinic

Crystal class: 2/m

Twinning: 

Unit cell: a = 6.722, b = 5.437, c = 3.555, β = 93°

Colour: White

Diaphaneity: Transparent

Luster: Vitreous

Habit: Tabular, microscopic crystals

Hardness: 3

Specific gravity: 2.5

Cleavage: [100] perfect

Tenacity: 

Streak: White

Synonyms/varieties:

Comments:  A polymorph of sibirskite