Comparison · Minerals
Analcime vs Aragonite
Analcime and Aragonite are easy to confuse because both are minerals. Analcime is harder (Mohs 5–5.5) than Aragonite (Mohs 3.5–4), so Analcime will scratch Aragonite and not the other way round. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Analcime and Aragonite
- Analcime is harder (Mohs 5–5.5) than Aragonite (Mohs 3.5–4), so Analcime will scratch Aragonite and not the other way round. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not.
- Aragonite feels noticeably heavier for its size (specific gravity 2.93–2.95 versus 2.24–2.29 for Analcime).
- They overlap in clear, gray, and pink, but Analcime also comes in green and Aragonite also comes in yellow and blue.
- Well-formed crystals give it away: Analcime is Isometric, Aragonite is Orthorhombic.
Analcime vs Aragonite properties
| Property | Analcime | Aragonite |
|---|---|---|
| Type | Minerals | Minerals |
| Mohs hardness | 5–5.5 | 3.5–4 |
| Luster | Vitreous | Vitreous to resinous |
| Streak | White | White |
| Transparency | Transparent to translucent | Transparent to translucent |
| Specific gravity | 2.24–2.29 | 2.93–2.95 |
| Crystal system | Isometric | Orthorhombic |
| Common colors | Colorless, White, Gray, Pink, Pale green | Colorless, White, Yellow, Gray, Blue, Pink |
| Rarity | common | common |
| Typical specimen value | $2–$150+ | $2–$150+ |
Which is more valuable?
Typical specimens of Analcime and Aragonite trade in a similar range, around $20.
About Analcime
Analcime is a hydrated sodium aluminosilicate, NaAlSi2O6·H2O, and one of the few zeolites to crystallize in the isometric system rather than a lower-symmetry one. It typically forms trapezohedral crystals with twenty-four faces, giving specimens a distinctive rounded, many-sided appearance. Chemically it sits at the boundary between the zeolite and feldspathoid mineral groups.
About Aragonite
Aragonite is calcium carbonate, CaCO3, crystallizing in the orthorhombic system as a metastable polymorph of the more common mineral calcite. It readily forms in low-temperature settings such as caves, hot springs, and the shells of many marine organisms, and it slowly converts to calcite over geologic time. Twinned crystal clusters resembling six-rayed stars are among its most recognizable forms.
Analcime vs Aragonite FAQ
Is Analcime the same as Aragonite?
No. Both are minerals, but they are distinct species with different hardness, streak or luster. Analcime is harder (Mohs 5–5.5) than Aragonite (Mohs 3.5–4), so Analcime will scratch Aragonite and not the other way round. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not.
How can you tell Analcime from Aragonite?
Analcime is harder (Mohs 5–5.5) than Aragonite (Mohs 3.5–4), so Analcime will scratch Aragonite and not the other way round. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not. Aragonite feels noticeably heavier for its size (specific gravity 2.93–2.95 versus 2.24–2.29 for Analcime). They overlap in clear, gray, and pink, but Analcime also comes in green and Aragonite also comes in yellow and blue.
Which is harder, Analcime or Aragonite?
Analcime is harder: Mohs 5–5.5 against Mohs 3.5–4 for Aragonite.
Which is more valuable, Analcime or Aragonite?
Typical specimens of Analcime and Aragonite trade in a similar range, around $20.
