mineral
White Howlite
Howlite, Ca2B5SiO9(OH)5
AI-generated identification · may be incorrectMohs hardness of 3.5, white or milky color with dark grey or black web-like veins, sub-vitreous to earthy luster, monoclinic crystal system.
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Physical properties
Mohs hardness of 3.5, white or milky color with dark grey or black web-like veins, sub-vitreous to earthy luster, monoclinic crystal system.
Formation & geological history
Formed as borate minerals in evaporite deposits, commonly found in lacustrine environments.
Uses & applications
Frequently used as a gemstone in jewelry, often dyed blue to imitate turquoise, and carved into ornamental decorative objects.
Geological facts
Howlite is porous and easily absorbs dyes, making it one of the most commonly color-enhanced stones on the market.
Field identification & locations
Identified by its softness, characteristic dark veining, and white chalky streak; found primarily in Nova Scotia, USA, and South Africa.
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Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous