Pyrope Garnet | Gemopedia

Hear the word "garnet," and what invariably comes to mind is the image of the deep red pyrope garnets belonging to the pyralspites family. Pyrope comes from the Greek word pyropos, meaning "fiery eyed." The rich reds are both affordable and beautiful, perfect for not only gemstone collections, but jewelry as well.
Alternate
Names
Chrome Pyrope, Bohemian Garnet (Not Recommended)
Colors
Medium To Dark Reddish Orange, Red Through Slightly Orange, Red To Pale Pink, Colorless

Pyrope Garnet Classification

Common Name

Pyrope Garnet

Species

Pyrope

Variety

Colors

Medium To Dark Reddish Orange, Red Through Slightly Orange, Red To Pale Pink, Colorless

Alternate Names

Chrome Pyrope, Bohemian Garnet (Not Recommended)

Gemstone Groups

Garnet

Key Separations

RI , SR nature and spectrum, possible SG. If stone has a pyrope spectrum and an RI slightly above 1.750 it is pyrope garnet. Stones with SG lower than 3.8 and a RI lower than 1.76 are pyrope and those with higher almandine.

Comments

Some rare light pink to colorless stone can have an RI as low as 1.717. Misnomers: Colorado ruby, Cape ruby, Arizona ruby, Bohemian carbuncle. Stones can show a chrome or non-chrome spectra.

Pyrope Garnet Optical Properties

Transparency

Transparent - Semitranslucent

Refractive Index

1.73-1.75

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Singly Refractive (SR) With ADR

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

None

Dispersion

Strength: moderate fire Value: 0.022

Comments

Pyrope Garnet Chemistry & Crystallography

Chemical Name

magnesium aluminum silicate

Chemical Formula

Mg3Al2(SiO4)3

Synthesis

Crystal System

Cubic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Pyrope Garnet Characteristic Physical Properties

Hardness

7-7.5

Streak

White

Specific Gravity

3.62-3.87 Range:0.09/-0.16 Typical:3.78

Toughness

Varies

Inclusions

Pyrope garnet is a type II clarity stone. Needle like inclusions and irregular, rounded crystals that can be apatite or zircon.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal

Cleavage

None

Comments

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