Zincite | Gemopedia

The majority of gem-quality zincite in the market is the byproduct of Polish metal refineries where the material crystallized in the factory smokestacks and was then harvested during cleaning. Zincite can also be found naturally in a few localities, most notably associated with metamorphosed zinc ore bodies in Sterling, New Jersey, though the crystals are rarely of gem quality.
Alternate
Names
Red-Zinc Ore
Colors
Medium To Pale Yellow, Medium Orange, Medium To Dark Reddish-Orange, Red, Green

Zincite Classification

Common Name

Zincite

Species

Zincite

Variety

Colors

Medium To Pale Yellow, Medium Orange, Medium To Dark Reddish-Orange, Red, Green

Alternate Names

Red-Zinc Ore

Gemstone Groups

Key Separations

OTL RI, DR nature and SG

Comments

Natural stones or specimens come from mines in New Jersey. There are some man made stones that come from Poland and are a byproduct of zinc metal extraction from ore.

Zincite Optical Properties

Transparency

Transparent - Opaque

Refractive Index

Over the Limit 2.013-2.029

Birefringence

0.016

Optic Character

Uniaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert to moderate yellow to orange or yellow-green
LWUV: Inert to moderate yellow to yellow-orange

CCF Reaction

Yellow: Inert to yellowish-green; Orange stone: weak pink; Reddish-orange: moderate red

Pleochroism

Unobservable

Dispersion

Strength: weak fire Value: 0.127

Comments

Zincite Chemistry & Crystallography

Chemical Name

zinc manganese oxide

Chemical Formula

(Zn,Mn2+)O

Synthesis

Crystal System

Hexagonal

Classification

Oxide

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Zincite Characteristic Physical Properties

Hardness

4

Streak

Orange-Yellow

Specific Gravity

5.5-5.9

Toughness

Poor

Inclusions

Luster

SubAdamantine

Stability

Fracture

Subconchoidal

Cleavage

Perfect, in one direction

Comments

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