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Zincite
Zincite is oxides, ZnO. In the hand, it rates 4 on the Mohs scale, and it runs deep red and orange-red. Blood-red to orange zinc oxide with an orange-yellow streak, natural material is nearly exclusive to Franklin, New Jersey, embedded with black franklinite and green willemite in white calcite. Natural: essentially Franklin and Sterling Hill, New Jersey.
The geology.
Zincite carries the formula ZnO. It belongs to the hexagonal system. On paper it is oxides.
It sits at 4 on the Mohs scale. The surface reads adamantine to resinous. Light behaviour is translucent to transparent. Specific gravity runs 5.66. The streak is orange-yellow. It breaks with perfect prismatic cleavage; conchoidal fracture.
Blood-red to orange zinc oxide with an orange-yellow streak, natural material is nearly exclusive to Franklin, New Jersey, embedded with black franklinite and green willemite in white calcite.
Expect to see it as massive grains in ore (natural), sharp glassy crystals (smelter-grown) or faceted stones.
The origins.
Natural: essentially Franklin and Sterling Hill, New Jersey. Crystals on the market: accidental growths from Polish zinc smelter chimneys.
On value, the database notes: franklin ore specimens modest; sharp smelter crystals cheap; natural crystals rare and prized.
Traditional associations.
In energy work traditions, zincite is treated as an intense vitality stone said to rekindle creative drive.
Recorded here because it is part of how this material is sold, not because it is a property of the material.
Spotting the real thing.
Blood-red to orange zinc oxide with an orange-yellow streak, natural material is nearly exclusive to Franklin, New Jersey, embedded with black franklinite and green willemite in white calcite.
Nearly all big glassy 'zincite crystals' sold are smelter-chimney growths from Poland, gorgeous and real ZnO, but industrial accidents, not mined minerals; honest dealers say so.
| Looks like | How to tell them apart |
|---|---|
| Cuprite | Cuprite streaks brownish-red and is denser; zincite's streak is orange-yellow |
| Realgar | Realgar is softer (1.5 to 2), orange streak too, but crumbles and degrades in light |
| Red glass/CZ | Glass streaks white and shows bubbles |
At-home tests.
None of these need a lab. A 10x loupe, good daylight and a steady hand cover most of what a buyer needs to know about zincite.
| Test | What you should see |
|---|---|
| By eye | Orange-yellow streak from a red mineral is a short list |
| Under UV | Franklin matrix pieces fluoresce: willemite green, calcite red, the famous combo |
| By eye | Heavy (5.66) and brittle |
Stop short of anything that leaves a mark. A gemologist can answer the rest without damaging the stone.
Care & handling.
At 4 on the Mohs scale this is a soft material. Keep it as a display piece, store it apart from harder stones, and skip daily-wear settings.
It breaks with perfect prismatic cleavage; conchoidal fracture, which is worth knowing before you set it or drop it.
Skip the ultrasonic. Lukewarm water, mild soap and a soft cloth handle routine cleaning without risk.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is ZnO. Crystal system: Hexagonal. Specific gravity: 5.66. Streak: Orange-yellow. Cleavage and fracture: Perfect prismatic cleavage; conchoidal fracture.
How it reaches the market
Natural: essentially Franklin and Sterling Hill, New Jersey. Crystals on the market: accidental growths from Polish zinc smelter chimneys.
What it gets confused with
Cuprite: Cuprite streaks brownish-red and is denser; zincite's streak is orange-yellow. Realgar: Realgar is softer (1.5 to 2), orange streak too, but crumbles and degrades in light. Red glass/CZ: Glass streaks white and shows bubbles.
What it is worth
Franklin ore specimens modest; sharp smelter crystals cheap; natural crystals rare and prized.
Where buyers get caught
Nearly all big glassy 'zincite crystals' sold are smelter-chimney growths from Poland, gorgeous and real ZnO, but industrial accidents, not mined minerals; honest dealers say so.
One more thing
Early radio experimenters used zincite in crystal-detector radios, the 'crystal' in crystal set, so this New Jersey ore mineral helped broadcast the first radio voices.
An education-first guide.
We do not carry zincite. This page exists because the question comes up and the honest answer is worth writing down, whether or not there is anything here to sell you.
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