Formula: MgBO2(OH)
Origin of name: for S. Szaibely, Hungarian mine surveyor
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 12.577, b = 10.393, c = 3.139, β = 95.88°
Colour: white to straw-yellow
Diaphaneity: Transparent to translucent
Luster: silky to dull, earthy
Habit: fibrous veinlets or masses, embedded nodules, may be dense or chalk-like
Hardness: 3 to 3.5
Specific gravity: 2.60
Cleavage: none
Tenacity: Conchoidal fracture
Streak: white
Synonyms/varieties: Ascharite, Camsellite
Comments: series with sussexite
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