mineral
Dyed Magnesite (Howlite imitation)
Magnesium carbonate (MgCO3) with dye
Hardness: 3.5 - 4.5. Color: Naturally white, dyed deep blue. Luster: Vitreous to dull. Crystal structure: Trigonal (often massive). Specific Gravity: 2.98 - 3.02.
- Hardness
- 3
- Color
- Naturally white, dyed deep blue
- Luster
- Vitreous to dull
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Physical properties
Hardness: 3.5 - 4.5. Color: Naturally white, dyed deep blue. Luster: Vitreous to dull. Crystal structure: Trigonal (often massive). Specific Gravity: 2.98 - 3.02.
Formation & geological history
Formed through the alteration of magnesium-rich rocks (like serpentine) via metamorphic or hydrothermal processes. This specific specimen has been carved and chemically dyed to resemble turquoise.
Uses & applications
Used primarily in costume jewelry as an affordable alternative to turquoise or lapis lazuli. Industrial applications include fire bricks and fertilizer.
Geological facts
Magnesite and howlite are frequently dyed bright blue to imitate high-grade turquoise because their porous structure easily absorbs pigments. The tell-tale sign is often the dye concentrating in the veins.
Field identification & locations
Identify by checking for uniform color saturation (or lack thereof) in cracks. Can be differentiated from real turquoise by a simple acetone test on an inconspicuous spot (dye will rub off) and by its lower hardness.
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