Formula: MgSO4 . H2O
Origin of name: For Dietrich G. Kieser (1770-1826), German academy president in Jena
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: On {001} contact, polysynthetic about [110]
Unit cell: a = 6.9, b = 7.71, c = 7.54, β = 116.17°
Colour: Colourless, white, grayish white, yellowish
Diaphaneity: Transparent to translucent
Luster: Vitreous - dull
Habit: Crystals bipyramidal; massive, coarse to fine granular
Hardness: 3.5
Specific gravity: 2.57
Cleavage: 5; {110} and {111} perfect, {111}, {101} and {001} imperfect
Tenacity: Friable to firm, uneven fracture
Streak: White
Synonyms/varieties:
Comments: Slowly soluble in water
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