gemstone

Turquoise (Likely Stabilized or Dyed Howlite/Magnesite)

CuAl6(PO4)4(OH)8·4H2O (if true turquoise), but likely dyed howlite Ca2B5SiO9(OH)5

AI-generated identification · may be incorrect

Hardness 5-6 (turquoise) or 3.5 (howlite). Waxy to subvitreous luster. Typically massive or cryptocrystalline. Color ranges from sky blue to green, often with matrix patterns. This bead shows intense, slightly mottled blue-green coloration indicative of dye or stabilization.

Identified September 15, 2026More gemstone →

Explore Turquoise (Likely Stabilized or Dyed Howlite/Magnesite) in the encyclopedia →

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Physical properties

Formation & geological history

True turquoise forms through the secondary alteration of copper, aluminum, and phosphorus-bearing minerals in arid environments. Often found in veins or nodules.

Uses & applications

Widely used in jewelry, cabochons, beads, and carvings. Historically significant as an ornamental stone.

Geological facts

Turquoise is one of the oldest known gemstones, used by ancient Egyptians and Native Americans. Many 'turquoise' beads on the market are actually dyed howlite or magnesite, which absorb dye well to mimic the look of natural turquoise.

Field identification & locations

Identify true turquoise by its specific gravity, hardness, and lack of dye accumulation in cracks. Destructive testing (like acetone on a cotton swab) can reveal dyed howlite. Natural high-grade turquoise is increasingly rare.