Turquoise (Dyed Howlite/Magnesite imitation)
CuAl6(PO4)4(OH)8·4H2O (Target mineral) / Ca2B5SiO9(OH)5 (Actual specimen: Howlite)
Rock Type: mineral
Physical Properties
Hardness: 3.5 (Howlite) vs 5-6 (True Turquoise); Color: Sky blue with dark grey/black veining; Luster: Sub-vitreous to earthy; Crystal Structure: Monoclinic; Cleavage: None visible in beads.
Formation & Geological History
Formed as a secondary mineral in evaporite deposits (Howlite). The blue color is achieved by immersing naturally white, porous mineral nodules in artificial dyes to mimic authentic Turquoise.
Uses & Applications
Primary use is in costume jewelry, beads, and mass-market craft ornaments. It serves as an affordable alternative to genuine Turquoise.
Geological Facts
Most low-to-mid-range 'Turquoise' jewelry is actually dyed Howlite or Magnesite. You can often tell by looking at the drill holes where the white interior of the original mineral may still be visible.
Field Identification & Locations
Identify by performing a 'swipe test' with acetone on a cotton swab; if blue dye comes off, it is treated. It is commonly found in jewelry shops and bead markets worldwide.
Identified on: 4/21/2026
Mode: Standard