Bustamite
A variety of Minerals
What is Bustamite?
Bustamite is a calcium manganese inosilicate (chain silicate) and a member of the wollastonite group. Magnesium, zinc and iron are common impurities substituting for manganese. Bustamite is the high-temperature polymorph of CaMnSi2O6 and johannsenite is the low temperature polymorph. The inversion takes place at 830 °C (1,530 °F), but may be very slow.Bustamite could be confused with light-colored rhodonite or pyroxmangite, but both these minerals are biaxial (+) whereas bustamite is biaxial (-).
Optical Properties
- Refractive Index
- 1.662-1.707
- Birefringence
- 0.014-0.015
- Optical Character
- Biaxial negative
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Bustamite 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.
Bustamite Localities Map
See where Bustamite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
The Meaning
Bustamite was once believed to have formed from the tears of Native American women who were crying over the loss of their husbands. Eagles would sometimes fly down, collect smaller stones and take them back to their nest. When early Native Americans witnessed this they began carrying the stones around for good luck.
Quick Facts
Physical Properties
- Color
- Pale to medium pink, brownish-red, colourless to yellowish-pink in transmitted light
- Hardness (Mohs)
- 5.5 - 6.5
- Density
- 3.421 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- CaMn2+(Si2O6)
- Elements
- Ca, Mn, O, Si
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Bustamite FAQs
How do I identify Bustamite?
Bustamite can be identified by its hardness of 5.5 - 6.5 on the Mohs scale, Pale to medium pink color. Look for these key characteristics when examining specimens.
What color is Bustamite?
Bustamite typically appears in Pale to medium pink, brownish-red, colourless to yellowish-pink in transmitted light. Color can vary depending on impurities and formation conditions.
How hard is Bustamite?
Bustamite has a hardness of 5.5 - 6.5 on the Mohs scale. This gives it moderate hardness.
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