Richterite | Gemopedia

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.
Colors
Brown, Yellow, Dark Red, Dark Green, Blue, Gray, Violet

Richterite Classification

Common Name

Richterite

Species

Richterite

Variety

Richterite

Colors

Brown, Yellow, Dark Red, Dark Green, Blue, Gray, Violet

Alternate Names

Gemstone Groups

Amphibole

Key Separations

Comments

Richterite Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.605-1.712

Birefringence

0.021

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

Trichroic, strong, varying shades of body color

Dispersion

Strength: strong fire

Comments

Richterite Chemistry & Crystallography

Chemical Name

sodium calcium magnesium iron silicate hydroxide

Chemical Formula

Na2Ca(Mg, Fe, Al)5(Si, Al)8O22(OH,F)2

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Richterite Characteristic Physical Properties

Hardness

5-6

Streak

Gray

Specific Gravity

2.97-3.45 Typical:3.1

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Fracture

Conchoidal, Uneven

Cleavage

Perfect, in one direction

Comments

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