Howlite tumbled
A variety of Howlite
What is Howlite tumbled?
Howlite tumbled is a white stone with veins of black or dark grey running throughout its polished surface. This stone is valued for its marble feel and ability to take dye. First found in Canada, howlite tumbled is now mined in the USA, Brazil, and South Africa. It is often made into decorative objects and when dyed blue, it resembles turquoise.
Optical Properties
- Refractive Index
- 1.583-1.608
- Birefringence
- 0.019
- Pleochroism
- None
- Optical Character
- Biaxial negative
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Howlite tumbled 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 tumbled Localities Map
See where Howlite tumbled is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Streak
- White
Chemical Properties
- Chemical Formula
- Ca2B5SiO9(OH)5
- Elements
- B, Ca, H, O, Si
Also Known As
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