Rhodochrosite (banded) | 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 present 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
Red, Pink, Pinkish Orange To Deep Red, Orangy Pink, Brownish Red With White Banding

Rhodochrosite (banded) Classification

Common Name

Rhodochrosite (banded)

Species

Rhodochrosite

Variety

Colors

Red, Pink, Pinkish Orange To Deep Red, Orangy Pink, Brownish Red With White Banding

Alternate Names

Gemstone Groups

Key Separations

RI, birefringence, appearance and spectrum. Use birefringence blink method.

Comments

SG sometimes 3.60.

Rhodochrosite (banded) Optical Properties

Transparency

Translucent - Opaque

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

Aggregate (AGG)

Fluorescence

SWUV: Inert to weak pink
LWUV: Inert to moderate pink

CCF Reaction

Pleochroism

None

Dispersion

Comments

Rhodochrosite (banded) Chemistry & Crystallography

Chemical Name

manganese carbonate

Chemical Formula

MnCO3

Synthesis

Crystal System

Trigonal

Classification

Carbonate

Nature

Natural

Crystallinity

Aggregate

Comments

Rhodochrosite (banded) Characteristic Physical Properties

Hardness

3.5-4.5

Streak

White

Specific Gravity

3.45-3.7 Typical:3.7

Toughness

Poor

Inclusions

Rhodochrosite has agate like "bacon strip" banding and might show a poor polish.

Luster

Vitreous

Stability

Fracture

Granular, Uneven

Cleavage

Perfect, in one direction

Comments

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