Which is rare, a montebrasite or an amblygonite?

Aileen Sporer asked a question: Which is rare, a montebrasite or an amblygonite?
Asked By: Aileen Sporer
Date created: Mon, Jun 14, 2021 6:25 AM

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Top best answers to the question «Which is rare, a montebrasite or an amblygonite»

  • Fluorine-dominant (F) amblygonites are much rarer than hydroxyl-dominant (OH) montebrasites. In addition, amblygonite has a biaxial (-) optic sign, while montebrasite has a biaxial (+) optic sign. Many gems labelled as amblygonites in collections may merit reexamination.

FAQ

Those who are looking for an answer to the question «Which is rare, a montebrasite or an amblygonite?» often ask the following questions:

👉 Which is rare montebrasite or fluorine dominant amblygonite?

  • Amblygonite and montebrasite form a mineral series. Fluorine-dominant (F) amblygonites are much rarer than hydroxyl-dominant (OH) montebrasites. In addition, amblygonite has a biaxial (-) optic sign, while montebrasite has a biaxial (+) optic sign. Many gems labelled as amblygonites in collections may merit reexamination.

👉 What's the difference between montebrasite and amblygonite?

  • Amblygonite = 3.11; montebrasite = 2.98. (Natromontebrasite* = 3.04-3.1). Cut amblygonites, Minas Gerais, Brazil. Gem cutting by Afonso Marques. Photo by Eurico Zimbres. Licensed under CC By-SA 3.0. Amblygonite and montebrasite form a mineral series.

👉 Is amblygonite rare?

Extremely rare, transparent Amblygonite has been faceted and used as a gemstone. The main, albeit sporadic, sources for gem-quality Amblygonite are Brazil and the USA.

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