Rhodochrosite (single crystal) | Gemopedia

One of nature's more exotic treasures, rhodochrosite is a manganese carbonate that gets its name from two Greek words: "rhodon," meaning rose and "chros," meaning color. A fitting name indeed as its finest colors range from very pale pink, pale to deep orangey red. Yellow to brown crystals are also known. Clean, transparent, facetable material is extremely rare and highly sought after by gem collectors. Faceting such crystals presents a challenge to cutters due to the gem's perfect cleavage in three directions. Semi-translucent to opaque rhodochrosite is often carved or cut en cabochon and typically displays "bacon strip" or "bull's eye" patterns.
Colors
Pink, Pinkish Orange To Deep Red

Rhodochrosite (single crystal) Classification

Common Name

Rhodochrosite (single crystal)

Species

Rhodochrosite

Variety

Colors

Pink, Pinkish Orange To Deep Red

Alternate Names

Gemstone Groups

Key Separations

RI, birefringence and spectrum. Use birefringence blink method. Stones have eye visible doubling.

Comments

Rhodochrosite (single crystal) Optical Properties

Transparency

Transparent - Translucent

Refractive Index

Over The Limit 1.597-1.817
Tolerance:(+0.003/-0.003)

Birefringence

0.22

Optic Character

Uniaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert to weak red
LWUV: Inert to moderate red

CCF Reaction

Pleochroism

Dichroic, moderate to strong red to yellowish orange and orangy pink to brownish red

Dispersion

Strength: weak fire Value: 0.015

Comments

Rhodochrosite (single crystal) Chemistry & Crystallography

Chemical Name

manganese carbonate

Chemical Formula

MnCO3

Synthesis

Crystal System

Trigonal

Classification

Carbonate

Nature

Natural

Crystallinity

Crystalline

Comments

Rhodochrosite (single crystal) Characteristic Physical Properties

Hardness

3.5-4.5

Streak

White

Specific Gravity

3.7-3.71

Toughness

Poor

Inclusions

Rhodochrosite typically has many liquid and 2-phase inclusions.

Luster

Vitreous

Stability

Fracture

Granular, Uneven

Cleavage

Perfect, in one direction

Comments

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