Comparison · Quartz Family vs Minerals
Blue Lace Agate vs Celestine
Blue Lace Agate and Celestine are easy to confuse. Blue Lace Agate is harder (Mohs 7) than Celestine (Mohs 3–3.5), so Blue Lace Agate will scratch Celestine and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Blue Lace Agate and Celestine
- Blue Lace Agate is harder (Mohs 7) than Celestine (Mohs 3–3.5), so Blue Lace Agate will scratch Celestine and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not.
- Luster is different: Blue Lace Agate is waxy while Celestine is vitreous, pearly on cleavage.
- Celestine feels noticeably heavier for its size (specific gravity 3.95–3.97 versus 2.6 for Blue Lace Agate).
- Hold a thin edge to the light: Blue Lace Agate is translucent, Celestine is Transparent to translucent.
- They overlap in blue and gray, but Blue Lace Agate also comes in white and Celestine also comes in clear, green, and orange.
- Well-formed crystals give it away: Blue Lace Agate is hexagonal, Celestine is Orthorhombic.
Blue Lace Agate vs Celestine properties
| Property | Blue Lace Agate | Celestine |
|---|---|---|
| Type | Quartz Family | Minerals |
| Mohs hardness | 7 | 3–3.5 |
| Luster | waxy | Vitreous, pearly on cleavage |
| Streak | White | White |
| Transparency | translucent | Transparent to translucent |
| Specific gravity | 2.6 | 3.95–3.97 |
| Crystal system | hexagonal | Orthorhombic |
| Common colors | Pale Blue, White, Blue, Gray | Colorless, Pale blue, White, Gray, Light green, Orange (rare) |
| Rarity | uncommon | common |
| Typical specimen value | $8–$250+ | $2–$150+ |
Which is more valuable?
Blue Lace Agate is usually the more valuable of the two: a typical collector specimen runs about $35 against $20 for Celestine, and premium Blue Lace Agate can reach $250 or more.
About Blue Lace Agate
Blue Lace Agate is a pale blue and white banded chalcedony variety valued for soft lace-like banding.
About Celestine
Celestine, also spelled celestite, is strontium sulfate, SrSO4, and the primary ore of strontium, crystallizing in the orthorhombic system. It is best known for growing in delicate pale blue, tabular crystals, a color that gave the mineral its name from the Latin caelestis, meaning heavenly. Celestine often forms alongside gypsum and calcite in sedimentary evaporite settings, distinguishing it from most other sulfate minerals of hydrothermal origin.
Blue Lace Agate vs Celestine FAQ
Is Blue Lace Agate the same as Celestine?
No. Blue Lace Agate is a quartz family while Celestine is a mineral. Blue Lace Agate is harder (Mohs 7) than Celestine (Mohs 3–3.5), so Blue Lace Agate will scratch Celestine and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not.
How can you tell Blue Lace Agate from Celestine?
Blue Lace Agate is harder (Mohs 7) than Celestine (Mohs 3–3.5), so Blue Lace Agate will scratch Celestine and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not. Luster is different: Blue Lace Agate is waxy while Celestine is vitreous, pearly on cleavage. Celestine feels noticeably heavier for its size (specific gravity 3.95–3.97 versus 2.6 for Blue Lace Agate).
Which is harder, Blue Lace Agate or Celestine?
Blue Lace Agate is harder: Mohs 7 against Mohs 3–3.5 for Celestine.
Which is more valuable, Blue Lace Agate or Celestine?
Blue Lace Agate is usually the more valuable of the two: a typical collector specimen runs about $35 against $20 for Celestine, and premium Blue Lace Agate can reach $250 or more.
