Comparison · Minerals
Eudialyte vs Hessonite
Eudialyte and Hessonite are easy to confuse because both are minerals. Hessonite is harder (Mohs 6.5–7) than Eudialyte (Mohs 5–5.5), so Hessonite will scratch Eudialyte 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 Eudialyte and Hessonite
- Hessonite is harder (Mohs 6.5–7) than Eudialyte (Mohs 5–5.5), so Hessonite will scratch Eudialyte and not the other way round. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not.
- Hessonite feels noticeably heavier for its size (specific gravity 3.5–3.65 versus 2.74–3.1 for Eudialyte).
- They overlap in red, brown, and yellow, but Eudialyte also comes in pink and Hessonite also comes in orange.
- Well-formed crystals give it away: Eudialyte is Trigonal, Hessonite is Cubic.
Eudialyte vs Hessonite properties
| Property | Eudialyte | Hessonite |
|---|---|---|
| Type | Minerals | Minerals |
| Mohs hardness | 5–5.5 | 6.5–7 |
| Luster | Vitreous to greasy | Vitreous to resinous |
| Streak | White | White |
| Transparency | Transparent to translucent | Transparent to translucent |
| Specific gravity | 2.74–3.1 | 3.5–3.65 |
| Crystal system | Trigonal | Cubic |
| Common colors | Red, Pink, Brownish-red, Yellow, Brown | Orange-brown, Cinnamon, Yellow-orange, Reddish brown |
| Rarity | common | common |
| Typical specimen value | $2–$150+ | $2–$150+ |
Which is more valuable?
Typical specimens of Eudialyte and Hessonite trade in a similar range, around $20.
About Eudialyte
Eudialyte is a complex, often pink to red zirconium silicate mineral crystallizing in the trigonal system, associated almost exclusively with unusual alkaline igneous rocks called nepheline syenites. Its name derives from Greek words meaning well decomposable, a reference to how readily it dissolves in acid compared to most silicate minerals. Nicknamed Saami blood stone in parts of Scandinavia, eudialyte's vivid coloring and rarity make it a favorite among collectors of unusual silicate minerals.
About Hessonite
Hessonite is a warm orange-brown to reddish-brown variety of grossular garnet, Ca3Al2(SiO4)3, colored by trace iron and manganese, and long prized in South Asian gem traditions under the Sanskrit name gomedh. Its slightly greasy internal luster and swirling, treacle-like inclusions, often described as a scotch-in-water effect, set it apart from other orange garnets and gemstones. It belongs to the calcium-aluminum garnet subgroup rather than the calcium-iron subgroup that includes andradite.
Eudialyte vs Hessonite FAQ
Is Eudialyte the same as Hessonite?
No. Both are minerals, but they are distinct species with different hardness, streak or luster. Hessonite is harder (Mohs 6.5–7) than Eudialyte (Mohs 5–5.5), so Hessonite will scratch Eudialyte and not the other way round. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not.
How can you tell Eudialyte from Hessonite?
Hessonite is harder (Mohs 6.5–7) than Eudialyte (Mohs 5–5.5), so Hessonite will scratch Eudialyte and not the other way round. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not. Hessonite feels noticeably heavier for its size (specific gravity 3.5–3.65 versus 2.74–3.1 for Eudialyte). They overlap in red, brown, and yellow, but Eudialyte also comes in pink and Hessonite also comes in orange.
Which is harder, Eudialyte or Hessonite?
Hessonite is harder: Mohs 6.5–7 against Mohs 5–5.5 for Eudialyte.
Which is more valuable, Eudialyte or Hessonite?
Typical specimens of Eudialyte and Hessonite trade in a similar range, around $20.
