mineral
White howlite (likely small tumbled pieces)
Howlite, Ca₂B₅SiO₉(OH)₅
AI-generated identification · may be incorrectOpaque ivory-white pieces with fine gray-brown veining and a dull-to-waxy surface; Mohs hardness 3.5, monoclinic crystal system, typically no visible cleavage. The image is not detailed enough to confirm identification; similar white minerals may look alike.
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Physical properties
Opaque ivory-white pieces with fine gray-brown veining and a dull-to-waxy surface; Mohs hardness 3.5, monoclinic crystal system, typically no visible cleavage. The image is not detailed enough to confirm identification; similar white minerals may look alike.
Formation & geological history
Howlite forms as a borate mineral in evaporite deposits, commonly associated with arid environments; its age depends on the host deposit.
Uses & applications
Used for beads, carvings, and inexpensive jewelry, and sometimes dyed to imitate turquoise.
Geological facts
Howlite is often sold polished or dyed; its characteristic dark, irregular veins help distinguish it from many other white stones.
Field identification & locations
Common sources include California and Nova Scotia. Check that the veins are natural-looking and that the material is not ceramic or another imitation; a hardness test should only be done on an inconspicuous spot.
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