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
Howlite tumbled Market Value Calculator
Estimate the market value of Howlite tumbled using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
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.
Map preview
North ZoneCentral RidgeSouth Basin
Quick Facts
Physical Properties
- Streak
- White
Chemical Properties
- Chemical Formula
- Ca2B5SiO9(OH)5
- Elements
- B, Ca, H, O, Si
Also Known As
Howlite tumbledHoweliteSilicoborocalcite
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