saf-ahyuh r

Richterite, named after a famous German chemist and co-discoverer of the element indium, is member of the amphibole group of minerals. Typically, richterite is near colorless to brown, however, if richterite is dominantly composed of potassium, it can be blue. In South Africa, it is associated with another blue mineral of similar chemical composition, sugilite.

Richterite Polished
Richterite Classification
Common Name Richterite
Species Amphibole
Richterite Optical Properties
Transparency Transparent - Opaque
Dispersion Strength: Strong Fire
Refractive Index 1.615-1.636
Birefringence 0.021
Optic Character Biaxial
Optic Sign Negative
Polariscope Reaction Aggregate (AGG), Doubly Refractive (DR)
Pleochroism Trichroic, strong, varying shades of body color
Richterite Characteristic Physical Properties
Hardness 5-6
Streak white
Specific Gravity 2.970-3.450 Typical:3.100
Toughness Poor
Luster Vitreous, Dull
Fracture Conchoidal, Uneven
Cleavage Perfect, in one direction
Richterite Chemistry & Crystallography
Chemical Name sodium calcium magnesium iron silicate hydroxide
Chemical Formula Na2Ca(Mg, Fe, Al)5(Si, Al)8O22(OH,F)2
Crystal System Monoclinic
Chemistry Classification Silicate

Richterite Colors

  • Green Richterite Green
  • Brown Richterite Brown
  • Red Richterite Red
  • Blue Richterite Blue
  • Gray Richterite Gray
  • Yellow Richterite Yellow

Countries of Origin

Myanmar; Afghanistan; Angola; Madagascar; Kazakhstan; Paraguay; Oman; Austria; Sweden; Malawi; China; Russian Federation (the); Brazil; Poland; Slovakia; France; United States of America (the); Japan; Kenya; Switzerland; India; Spain; New Zealand; Canada; Turkey; Norway; Namibia; Finland; Denmark; Italy; Uganda; Antarctica; Australia; Germany; Indonesia; Yemen

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Tim Matthews


Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.