Ezcurrite

Formula:   Na₄B₁₀O₁₇ ^. 7H₂O

Origin of name:   For John M. Ezcurra, Argentine mine manager

Crystal system:   Triclinic

Crystal class:   -1

Twinning:

Unit cell: a = 8.598, b = 9.57, c = 6.576, α = 102.75°, β = 107.5°, γ = 71.5°

Colour:  Colourless

Diaphaneity:  Transparent

Luster:   Vitreous to satiny

Habit:   Crystals elongated, tiny; cleavable masses with bladed fibrous structure

Hardness:   3 to 3.5

Specific gravity:   2.053

Cleavage:   6; {110} excellent, {010} good, {100} and {-1-26}

Tenacity: 

Streak: White

Synonyms/varieties:

Comments: