mineral

Heart-shaped polished howlite (likely dyed or stabilized)

Howlite, Ca₂B₅SiO₉(OH)₅; possibly sold as imitation turquoise

AI-generated identification · may be incorrect

Creamy white to pale green, with dark gray-brown veining; vitreous to waxy polish and massive, non-crystalline appearance. Mohs hardness 3.5; brittle, with uneven fracture and no obvious cleavage. The greenish tint may be treatment or lighting, so identification from the image is provisional.

Identified October 8, 2026More mineral →

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Physical properties

Formation & geological history

Howlite forms as a borate mineral in evaporite deposits, commonly in arid settings; it is geologically recent relative to many rocks. The hearts are cut and polished human-processed specimens.

Uses & applications

Carved into beads, cabochons, and ornaments; often used in inexpensive jewelry and as a turquoise substitute.

Geological facts

Howlite’s characteristic dark web-like veins make it easy to color and market as imitation turquoise.

Field identification & locations

Look for a lightweight, soft white or pale stone with irregular dark veins; genuine turquoise is typically harder and more uniformly blue-green. Howlite occurs notably in California, Nova Scotia, and parts of Turkey.