Comparison · Minerals
Chabazite vs Heulandite
Chabazite and Heulandite are easy to confuse because both are minerals. Both sit near Mohs 4–5, 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 Chabazite and Heulandite
- Both sit near Mohs 4–5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- They overlap in clear, pink, red, and yellow, but Heulandite also comes in brown.
- Well-formed crystals give it away: Chabazite is Trigonal, Heulandite is Monoclinic.
Chabazite vs Heulandite properties
| Property | Chabazite | Heulandite |
|---|---|---|
| Type | Minerals | Minerals |
| Mohs hardness | 4–5 | 3.5–4 |
| Luster | Vitreous | Vitreous, pearly on cleavage |
| Streak | White | White |
| Transparency | Transparent to translucent | Transparent to translucent |
| Specific gravity | 2.05–2.15 | 2.1–2.2 |
| Crystal system | Trigonal | Monoclinic |
| Common colors | White, Colorless, Pink, Red, Yellow | White, Colorless, Pink, Red, Brown, Yellow |
| Rarity | common | common |
| Typical specimen value | $2–$150+ | $2–$150+ |
Which is more valuable?
Typical specimens of Chabazite and Heulandite trade in a similar range, around $20.
About Chabazite
Chabazite is a calcium-bearing zeolite mineral with the general formula (Ca,Na2,K2)Al2Si4O12·6H2O, known for its distinctive pseudo-cubic rhombohedral crystals that superficially resemble cubes. It forms in cavities within basaltic and volcanic rocks where hot, mineral-rich fluids circulate after the host lava cools, placing it among the classic zeolite minerals collected from vesicles in ancient lava flows. Its open, cage-like aluminosilicate framework allows it to absorb and exchange ions, a property shared with other zeolites and exploited in some industrial applications.
About Heulandite
Heulandite is a calcium- and sodium-bearing zeolite mineral, part of a group known for its coffin-shaped monoclinic crystals with a distinctive pearly luster on one prominent cleavage face. It typically forms as a secondary mineral filling vesicles and fractures in basaltic and volcanic rocks, alongside other zeolites deposited by cooling hydrothermal fluids. Heulandite is named after English mineral collector Henry Heuland, whose collection contributed significantly to early zeolite mineralogy.
Chabazite vs Heulandite FAQ
Is Chabazite the same as Heulandite?
No. Both are minerals, but they are distinct species with different hardness, streak or luster. Both sit near Mohs 4–5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
How can you tell Chabazite from Heulandite?
Both sit near Mohs 4–5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. They overlap in clear, pink, red, and yellow, but Heulandite also comes in brown. Well-formed crystals give it away: Chabazite is Trigonal, Heulandite is Monoclinic.
Which is harder, Chabazite or Heulandite?
Chabazite is harder: Mohs 4–5 against Mohs 3.5–4 for Heulandite.
Which is more valuable, Chabazite or Heulandite?
Typical specimens of Chabazite and Heulandite trade in a similar range, around $20.
