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Porcelain Jasper
Porcelain Jasper is silicate (porcelain jasper), SiO2 with iron and clay impurities. In the hand, it rates 6.5 to 7 on the Mohs scale, and it runs mauve and plum. Ultra-smooth jasper in unusual mauve, plum, and gray-blue swirls with hairline dark squiggle lines, polishing like glazed china.
The geology.
Porcelain Jasper carries the formula SiO2 with iron and clay impurities. It belongs to the trigonal (cryptocrystalline) system. The trade files it under silicate (porcelain jasper).
It sits at 6.5 to 7 on the Mohs scale. The surface reads vitreous, porcelain-like on polish. Light behaviour is opaque. Specific gravity runs 2.58 to 2.91. The streak is white. It breaks with conchoidal fracture.
Ultra-smooth jasper in unusual mauve, plum, and gray-blue swirls with hairline dark squiggle lines, polishing like glazed china.
Common cuts are cabochons, beads or polished slabs.
The origins.
Exotica/Sci-Fi material from Chihuahua, Mexico; related porcelain jaspers from other rhyolite districts.
On value, the database notes: mid-range; striking Sci-Fi patterns trend higher.
Traditional associations.
In energy work traditions, associated with smoothing emotional turbulence and refined calm.
Included for completeness. Tradition is worth knowing about, and it is worth keeping separate from the mineralogy.
Spotting the real thing.
Ultra-smooth jasper in unusual mauve, plum, and gray-blue swirls with hairline dark squiggle lines, polishing like glazed china.
Not faked; several pattern grades share the name, the porcelain texture is the constant.
| Looks like | How to tell them apart |
|---|---|
| Picasso marble | Picasso marble scratches with a knife and fizzes; porcelain jasper scratches glass |
| Imperial jasper | Imperial shows orb-egg patterns; porcelain jasper (Sci-Fi) runs smoky swirls and squiggles |
| Purple banded fluorite | Fluorite shows transparency, cleavage sparkle, and much lower hardness |
At-home tests.
These checks cost nothing. Daylight, a 10x loupe and a little patience are the whole kit for porcelain jasper.
| Test | What you should see |
|---|---|
| Scratch check | Scratches glass (Mohs 6.5 to 7) |
| Acid check | No fizz with vinegar |
| By eye | Glazed-china polish with fine dark pen lines |
If these checks leave you unsure, that is what appraisers are for. Do not file, heat or soak a piece to find out.
Care & handling.
At 6.5 to 7 on the Mohs scale it handles careful wear but scratches against quartz and dust. Store it separately and take rings off before rough work.
It breaks with conchoidal fracture, which is worth knowing before you set it or drop it.
Most damage happens during cleaning, not wearing. Avoid steamers, ultrasonic tanks and anything from under the sink.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is SiO2 with iron and clay impurities. Crystal system: Trigonal (cryptocrystalline). Specific gravity: 2.58 to 2.91. Streak: White. Cleavage and fracture: Conchoidal fracture.
How it reaches the market
Exotica/Sci-Fi material from Chihuahua, Mexico; related porcelain jaspers from other rhyolite districts.
What it gets confused with
Picasso marble: Picasso marble scratches with a knife and fizzes; porcelain jasper scratches glass. Imperial jasper: Imperial shows orb-egg patterns; porcelain jasper (Sci-Fi) runs smoky swirls and squiggles. Purple banded fluorite: Fluorite shows transparency, cleavage sparkle, and much lower hardness.
What it is worth
Mid-range; striking Sci-Fi patterns trend higher.
Where buyers get caught
Not faked; several pattern grades share the name, the porcelain texture is the constant.
One more thing
Dealers nicknamed the Mexican find 'Sci-Fi jasper' because the gray-mauve swirls and circuit-like lines look airbrushed onto a spaceship hull.
An education-first guide.
There is nothing to buy on this page. Porcelain Jasper is not part of our catalogue, and the guide is here anyway because somebody searching the name deserves a straight answer.
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