Howlite
What is Howlite?
Howlite is a borate mineral that is typically white or grey with dark, often irregular, veining. It is a relatively soft mineral, making it popular for carving and jewelry. Howlite is often dyed to resemble other gemstones, such as turquoise.
Optical Properties
- Refractive Index
- 1.583 - 1.600
- Birefringence
- 0.005
- Pleochroism
- None
- Optical Character
- Biaxial (-)
- Dispersion
- Low
Howlite Market Value Calculator
Estimate the market value of Howlite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Howlite Localities Map
See where Howlite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Map preview
North ZoneCentral RidgeSouth Basin
More Images
© Ronnie Van Dommelen
© Myself (Adrian Pingstone).
© File Upload Bot (Magnus Manske)
Quick Facts
Physical Properties
- Color
- White, Grey, sometimes with black or grey veining
- Hardness (Mohs)
- 3.5
- Density
- 2.58 - 2.64 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- Ca2B5SiO9(OH)5
- Elements
- Calcium, Silicon, Boron, Oxygen, Hydrogen
Also Known As
White HowliteWhite TurquoiseKaolinite
FREE APP
4.7
Identify Howlite Instantly
- Snap a photo, get instant results
- 6,700+ rocks, minerals & crystals
- Discover collecting spots near you