Eakerite

Formula:   Ca₂SnAl₂Si₆O₁₈(OH)₂ ^. 2H₂O

Origin of name:   For Jack Eaker, American mineral collector

Crystal system:   Monoclinic

Crystal class:   2/m

Twinning:

Unit cell: a = 15.83 Ǻ, b = 7.72 Ǻ, c = 7.44  Ǻ, β = 101.3°

Colour:  Colourless to milky white

Diaphaneity:

Luster:   Vitreous

Habit:   Crystals elongated, prismatic, small

Hardness:   ~ 5.5

Specific gravity:   2.93

Cleavage:   None

Tenacity:   Conchoidal

Streak: 

Synonyms/varieties:

Comments: