mineral
Dyed Howlite (often sold as Turquenite)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
Hardness: 3.5 (natural state); Color: Light blue with dark grey/black veining; Luster: Sub-vitreous to dull; Crystal structure: Monoclinic; Opaque.
- Hardness
- 3
- Color
- Light blue with dark grey/black veining
- Luster
- Sub-vitreous to dull
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Physical properties
Hardness: 3.5 (natural state); Color: Light blue with dark grey/black veining; Luster: Sub-vitreous to dull; Crystal structure: Monoclinic; Opaque.
Formation & geological history
Howlite is an evaporite mineral found in nodules in sedimentary basins. This specific specimen has been carved into a double-terminated hexagonal point and chemically dyed to resemble turquoise.
Uses & applications
Primarily used in costume jewelry, lapidary work, and as a metaphysical or healing stone. It is a common substitute for genuine turquoise.
Geological facts
Howlite is naturally white or milky grey with dark veins. Because of its porous nature, it absorbs dye very well. It was first discovered near Windsor, Nova Scotia in 1868 by Henry How.
Field identification & locations
Identify by checking for white patches inside scratches (dye may not penetrate the center) or by wiping with acetone to see if color bleeds. Naturally found in Canada, USA, Germany, and Turkey.
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