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Dominant species
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Halloysite
Chemical
Formula
Al2Si2O5(OH)4
Species
Silicates
Crystal
System
Monoclinic
Mohs
Scale
1-2
Specific
Gravity
2-2.65
Color
White; grey, green, blue, yellow, red from included impurities.
Streak
Paler than the color, or white.
Luster
Waxy, Earthy
Refractive
Index
n = 1.553 - 1.565 n = 1.559 - 1.569 n = 1.560 - 1.570
Diaphaneity
Translucent, Opaque
Cleavage
Probable on
Fracture
Sub-Conchoidal
Crystal Habit:Spherical clusters, massive
Geological Setting:Halloysite is found in widely varied environments, including as an alteration of basaltic rocks, in hydrothermally altered fissure deposits in monzonites; it is also derived from feldspars, chlorites, micas, rhyolites, granites, volcanic ash, tuffs and pumices. More rarely found in granitic pegmatites, bauxites or laterites, and in some marine and glacial clays.
Halloysite7454
Halloysite7454
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Halloysite7451

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