mineral

Dyed blue tumbled stone, likely howlite or magnesite

Howlite (Ca₂B₅SiO₉(OH)₅) or magnesite (MgCO₃), artificially dyed blue

AI-generated identification · may be incorrect

Opaque vivid blue with cloudy gray-white veining and a polished glassy-to-waxy luster; likely Mohs 3–4. The rounded shape is tumbled, and the color is not natural. No visible crystal structure or cleavage.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Howlite forms as a borate mineral in evaporite-related deposits, while magnesite forms by alteration of magnesium-rich rocks; both are commonly dyed commercially. Their geological ages vary by deposit, generally from young sedimentary or hydrothermal settings to older metamorphic terranes.

Uses & applications

Used mainly as an inexpensive jewelry, lapidary, and decorative material; it has little industrial value in this dyed form.

Geological facts

Blue dye often concentrates in pores, fractures, and surface pits. A cotton swab with acetone may sometimes remove dye, though testing can damage the finish.

Field identification & locations

Identify it by its intense artificial blue color, irregular pale veining, low hardness, and lightweight feel; common sources include China and the western United States. It is not likely natural turquoise or lapis lazuli, which generally show different textures and mineral associations.