Bakerite

Formula:  Ca₄B₄(BO₄)(SiO₄)₃(OH)₃ ^. H₂O

Origin of name:  For Richard C. Baker, of Nutfield, Surrey, England. Mining director of the Pacific Coast Borax Co.

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell: a = 4.83 Å, b = 7.60 Å, c = 9.61 Å, b = 90°2'

Colour:  Colourless; massive material white

Diaphaneity: Translucent to opaque due to clay inclusions

Luster:  Vitreous

Habit:  Crystals stout prismatic; thin tabular; nodules, veins, most commonly as dense fine-grained aggregates or massive

Hardness:  4.5

Specific gravity:  2.88

Cleavage:  None

Tenacity:

Streak:

Synonyms/varieties:

Comments: Gadolinite group. Found as irregular veins in altered volcanic rocks