Comparison · Materials
Glass vs Opalite
Glass and Opalite are easy to confuse because both are materials. Both sit near Mohs 5.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Glass and Opalite
- Both sit near Mohs 5.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- They overlap in blue, but Glass also comes in green, brown, and clear and Opalite also comes in white and yellow.
Glass vs Opalite properties
| Property | Glass | Opalite |
|---|---|---|
| Type | Materials | Materials |
| Mohs hardness | 5.5 | 5.5 |
| Luster | vitreous | vitreous |
| Streak | White to colorless | White to colorless |
| Transparency | translucent | translucent |
| Specific gravity | 2.5 | 2.4 |
| Crystal system | amorphous | amorphous |
| Common colors | Green, Brown, Clear, Blue, White, Frosted | Milky White, Blue, Yellow, Opalescent |
| Rarity | common | common |
| Typical specimen value | $1–$40+ | $3–$70+ |
Which is more valuable?
Opalite is usually the more valuable of the two: a typical collector specimen runs about $15 against $5 for Glass, and premium Opalite can reach $70 or more.
About Glass
Glass is a man-made amorphous material. Surf-tumbled sea glass and weathered bottle shards are among the most common glassy finds mistaken for natural minerals.
About Opalite
Opalite is a retail trade name for manmade opalescent glass and related opal simulants, commonly sold as tumbled stones or jewelry.
Glass vs Opalite FAQ
Is Glass the same as Opalite?
No. Both are materials, but they are distinct species with different hardness, streak or luster. Both sit near Mohs 5.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
How can you tell Glass from Opalite?
Both sit near Mohs 5.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. They overlap in blue, but Glass also comes in green, brown, and clear and Opalite also comes in white and yellow.
Which is harder, Glass or Opalite?
They are about equally hard, both near Mohs 5.5.
Which is more valuable, Glass or Opalite?
Opalite is usually the more valuable of the two: a typical collector specimen runs about $15 against $5 for Glass, and premium Opalite can reach $70 or more.
