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Dominant species
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Borax
Chemical
Formula
Na2B4O5OH4·8H2O
Species
Borates
Crystal
System
Monoclinic
Mohs
Scale
2
Color
Colourless, grey, white, yellowish, seldom bluish or greenish; colourless in transmitted light.
Streak
White
Luster
Vitreous, Resinous, Earthy
Refractive
Index
n = 1.447 n = 1.469 n = 1.472
Diaphaneity
Translucent, Opaque
Cleavage
PerfectOn perfect; on less perfect; on in traces.
Fracture
Conchoidal
Crystal Habit:Crystals commonly short-prismatic and often rather tabular . Prominent zones and . Faces "m," "o," and "z" often striated parallel to . Crystals often malformed through abnormal development of part of one or more zones.
Geological Setting:In evaporite deposits, salt lakes, playas, and efflorescences on soils in arid regions, in solution in hot springs.
Borax5549
Borax5549
Borax5546
Borax5546
Borax5541
Borax5541