Formula: Na2B(OH)4Cl
Origin of name: forJohn Edgar Teeple (1874-1931), chemist, for his contributions to the mineral chemistry of Searles Lake, California, U.S.A.
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell: a = 7.26, c = 4.85
Colour: White, colourless, pale buff due to organic inclusions
Diaphaneity: Transparent
Luster: Vitreous to greasy, becomes dull on exposure
Habit: crystals tabular, interpenetrating groups, commonly forms aggregates of rosettes
Hardness: 3 to 3.5
Specific gravity: 2.08
Cleavage: none
Tenacity: Very brittle, irregular to subconchoidal fracture
Streak:
Synonyms/varieties:
Comments: Soluble in water, alters to tincalconite on exposure
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