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
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Howlite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Howlite Localities Map
See where Howlite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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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
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Howlite FAQs
How do I identify Howlite?
Howlite can be identified by its hardness of 3.5 on the Mohs scale, White color. Look for these key characteristics when examining specimens.
What color is Howlite?
Howlite typically appears in White, Grey, sometimes with black or grey veining. Color can vary depending on impurities and formation conditions.
How hard is Howlite?
Howlite has a hardness of 3.5 on the Mohs scale. This gives it moderate hardness.