The facts
What bustamite actually is
Bustamite is classified as bustamite (pyroxenoid), with the composition (Ca,Mn²⁺)₃Si₃O₉. It crystallises in the triclinic system.
Colour comes from mn²⁺ giving pink to brownish-red, which is also what a laboratory looks at when it is asked whether a colour is natural.
Refractive index 1.640–1.710. Specific gravity around 3.32–3.43. Cleavage: perfect {100}, good {110}. Those three numbers separate it from most of what imitates it.
Where bustamite comes from
Bustamite is produced at Tetela de Ocampo, Puebla, Mexico (type locality), Broken Hill, New South Wales, Australia, N'Chwaning Mines, Kalahari Manganese Field, South Africa and Franklin, New Jersey, USA.
The locality is part of the description, not a footnote — two stones of the same weight from two of these places are not the same stone.
How bustamite is treated
Untreated. Colour of some material fades in sunlight, which is a genuine wear consideration. Frequently mislabelled as rhodonite; the lower RI and different cleavage separate them.
Treatment changes value, sometimes by a multiple, so it belongs in the description before the price and not after the sale.
What bustamite is confused with
In the trade bustamite is most often mistaken for, or substituted by, Rhodonite, Thulite, Pectolite or Rhodochrosite.
The separation is rarely a matter of opinion: refractive index 1.640–1.710 and specific gravity 3.32–3.43 settle most of it in a minute, and magnification settles the rest.
What bustamite is used for
Demand for bustamite comes from mineral collecting, carving and sculpture, decorative objects and jewellery, which is why one price per carat never covers it.
We quote each application in the unit that trade actually buys in, by the specimen, by the block or by the piece.
Durability and care
Bustamite is 5.5–6.5 on the Mohs scale, with perfect {100}, good {110} cleavage.
Hardness is not the whole story. Perfect cleavage means the stone can split cleanly if struck along the wrong plane, whatever its Mohs number, so a protective setting matters more here than the hardness suggests.
Warm water, mild soap and a soft brush. Avoid ultrasonic cleaners on anything fracture-filled, stabilised, dyed or visibly included.
What bustamite costs
As a guide, bustamite trades around $5–100/ct.
That is a range, not a quote. Colour, size, clarity, cut and origin move the figure a long way inside it, and the only honest price is one given against a specific stone. Send us what you need and we will price it.
Questions
Is bustamite treated, and how?
Untreated. Colour of some material fades in sunlight, which is a genuine wear consideration. Frequently mislabelled as rhodonite; the lower RI and different cleavage separate them.
Where does bustamite come from?
Tetela de Ocampo, Puebla, Mexico (type locality), Broken Hill, New South Wales, Australia, N'Chwaning Mines, Kalahari Manganese Field, South Africa and Franklin, New Jersey, USA. Origin affects price, so we name the locality rather than the country on every quote.
Is bustamite hard enough to wear every day?
With care. It is 5.5–6.5 on the Mohs scale, which is hard enough, but perfect {100}, good {110} cleavage means it can split if struck at the wrong angle. Use a protective setting and avoid ultrasonic cleaning.
How much does bustamite cost?
Indicatively $5–100/ct. Colour, size, clarity and origin move the price a long way within that, so treat it as a range and ask for a quote against a specific stone.
What is bustamite confused with?
Most often Rhodonite, Thulite, Pectolite and Rhodochrosite. A refractive index of 1.640–1.710 and a specific gravity near 3.32–3.43 separate it quickly.
What is bustamite used for besides jewellery?
mineral collecting, carving and sculpture and decorative objects. Each of those trades buys it in a different form and a different unit.
Related stones
Looking for bustamite?
Tell us the size, the quality and what it is for. We source it, photograph it and quote it — with the locality named.
Ask about bustamite