Libyan Desert Glass
Libyan Desert Glass is impact glass (impactite), SiO₂ (~98%, natural glass). In the hand, it rates 6 on the Mohs scale, and it runs pale lemon yellow and straw. Pale lemon-yellow natural glass from the Egyptian Sand Sea, wind-frosted surfaces, swirled internal flow with cristobalite snow-puffs, remarkably pure silica.
The geology.
Libyan Desert Glass carries the formula SiO₂ (~98%, natural glass). It belongs to the amorphous system. Its listing category is impact glass (impactite).
It sits at 6 on the Mohs scale. The surface reads vitreous to greasy. Light behaviour is transparent to translucent. Specific gravity runs 2.21 to 2.22. The streak is white. It breaks with conchoidal fracture.
Pale lemon-yellow natural glass from the Egyptian Sand Sea, wind-frosted surfaces, swirled internal flow with cristobalite snow-puffs, remarkably pure silica.
It turns up mostly as wind-polished lumps, sculpted fragments, faceted or jewelry.
The origins.
Great Sand Sea, western Egypt near the Libyan border, scattered across remote dunes, source impact ~29 million years ago.
On value, the database notes: mid-range to prized and rising; export restrictions squeeze supply.
Traditional associations.
In energy work traditions, associated with personal will and 'golden ray' solar themes.
This is lore, and we label it as lore. The measurable facts are further up the page.
Spotting the real thing.
Pale lemon-yellow natural glass from the Egyptian Sand Sea, wind-frosted surfaces, swirled internal flow with cristobalite snow-puffs, remarkably pure silica.
Heavily faked with yellow glass as supply tightens, real LDG shows frosted skin, flow swirls, and cristobalite puffs, and is never bargain-cheap.
| Looks like | How to tell them apart |
|---|---|
| Yellow bottle glass | Man-made glass shows round bubbles, mold sheen, and no wind-matte skin; LDG has elongated bubbles and dusty white cristobalite inclusions |
| Citrine | Citrine is crystalline quartz, harder, denser, with crystal optics |
| Moldavite | Moldavite is bottle-green and etched; LDG is yellow and wind-smoothed |
At-home tests.
A loupe and a window seat settle most questions about libyan desert glass. No workshop required.
| Test | What you should see |
|---|---|
| By eye | Pale yellow color with frosted desert polish |
| Loupe | swirls plus white cristobalite specks |
| By weight | Light for glass (SG 2.2); scratches a knife blade |
Destructive tests belong to a gemologist, not a kitchen table. If a piece matters to you, pay for an appraisal before you take a file to it.
Care & handling.
At 6 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.
Clean it by hand, dry it properly, and keep it away from ultrasonic cleaners and hot steam.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is SiO₂ (~98%, natural glass). Crystal system: Amorphous. Specific gravity: 2.21 to 2.22. Streak: White. Cleavage and fracture: Conchoidal fracture.
How it reaches the market
Great Sand Sea, western Egypt near the Libyan border, scattered across remote dunes, source impact ~29 million years ago.
What it gets confused with
Yellow bottle glass: Man-made glass shows round bubbles, mold sheen, and no wind-matte skin; LDG has elongated bubbles and dusty white cristobalite inclusions. Citrine: Citrine is crystalline quartz, harder, denser, with crystal optics. Moldavite: Moldavite is bottle-green and etched; LDG is yellow and wind-smoothed.
What it is worth
Mid-range to prized and rising; export restrictions squeeze supply.
Where buyers get caught
Heavily faked with yellow glass as supply tightens, real LDG shows frosted skin, flow swirls, and cristobalite puffs, and is never bargain-cheap.
One more thing
Tutankhamun's pectoral scarab is carved Libyan desert glass, pharaohs wore an asteroid event 3,300 years before science explained it.
An education-first guide.
We do not stock libyan desert glass. Writing it up regardless is the point of a reference library.
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