Comparison · Minerals vs Silicate Minerals
Hessonite vs Spessartine
Hessonite and Spessartine are easy to confuse. Both sit near Mohs 6.5–7, 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 Hessonite and Spessartine
- Both sit near Mohs 6.5–7, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Spessartine feels noticeably heavier for its size (specific gravity 4.19 versus 3.5–3.65 for Hessonite).
- Hold a thin edge to the light: Hessonite is Transparent to translucent, Spessartine is transparent.
- Well-formed crystals give it away: Hessonite is Cubic, Spessartine is cubic.
Hessonite vs Spessartine properties
| Property | Hessonite | Spessartine |
|---|---|---|
| Type | Minerals | Silicate Minerals |
| Mohs hardness | 6.5–7 | 7 |
| Luster | Vitreous to resinous | vitreous |
| Streak | White | White |
| Transparency | Transparent to translucent | transparent |
| Specific gravity | 3.5–3.65 | 4.19 |
| Crystal system | Cubic | cubic |
| Common colors | Orange-brown, Cinnamon, Yellow-orange, Reddish brown | Orange, Red, Brownish red, Yellowish orange |
| Rarity | common | uncommon |
| Typical specimen value | $2–$150+ | $15–$900+ |
Which is more valuable?
Spessartine is usually the more valuable of the two: a typical collector specimen runs about $120 against $20 for Hessonite, and premium Spessartine can reach $900 or more.
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.
About Spessartine
Spessartine is the manganese aluminum member of the garnet group, prized for its bright orange to reddish-orange color. It forms well-shaped dodecahedral or trapezohedral crystals, often in pegmatites or on smoky quartz, and the most vivid stones are cut as gems.
Hessonite vs Spessartine FAQ
Is Hessonite the same as Spessartine?
No. Hessonite is a mineral while Spessartine is a silicate mineral. Both sit near Mohs 6.5–7, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
How can you tell Hessonite from Spessartine?
Both sit near Mohs 6.5–7, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Spessartine feels noticeably heavier for its size (specific gravity 4.19 versus 3.5–3.65 for Hessonite). Hold a thin edge to the light: Hessonite is Transparent to translucent, Spessartine is transparent.
Which is harder, Hessonite or Spessartine?
They are about equally hard, both near Mohs 6.5–7.
Which is more valuable, Hessonite or Spessartine?
Spessartine is usually the more valuable of the two: a typical collector specimen runs about $120 against $20 for Hessonite, and premium Spessartine can reach $900 or more.
