Comparison · Organic Gems vs Carbonates
Red Coral vs Rhodochrosite
Red Coral and Rhodochrosite are easy to confuse. Both sit near Mohs 3.5, 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 Red Coral and Rhodochrosite
- Both sit near Mohs 3.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Rhodochrosite feels noticeably heavier for its size (specific gravity 3.65 versus 2.65 for Red Coral).
- Hold a thin edge to the light: Red Coral is opaque, Rhodochrosite is translucent.
- They overlap in red, pink, and orange, but Red Coral also comes in white and Rhodochrosite also comes in brown.
Red Coral vs Rhodochrosite properties
| Property | Red Coral | Rhodochrosite |
|---|---|---|
| Type | Organic Gems | Carbonates |
| Mohs hardness | 3.5 | 3.75 |
| Luster | vitreous | vitreous |
| Streak | White | White |
| Transparency | opaque | translucent |
| Specific gravity | 2.65 | 3.65 |
| Crystal system | trigonal | trigonal |
| Common colors | Red, Pink, Orange, White | Pink, Rose red, Red, Orange, Brown |
| Rarity | rare | uncommon |
| Typical specimen value | $50–$3000+ | $15–$900+ |
Which is more valuable?
Red Coral is usually the more valuable of the two: a typical collector specimen runs about $300 against $120 for Rhodochrosite, and premium Red Coral can reach $3000 or more.
About Red Coral
Precious coral is formed from the skeletons of marine animals. Red coral from the Mediterranean has been prized for jewelry for thousands of years.
About Rhodochrosite
Rhodochrosite is a manganese carbonate famous for its rose-pink to deep red color. It occurs as transparent rhombohedral crystals as well as banded pink-and-white masses, and it is popular with both collectors and lapidaries.
Red Coral vs Rhodochrosite FAQ
Is Red Coral the same as Rhodochrosite?
No. Red Coral is a organic gem while Rhodochrosite is a carbonate. Both sit near Mohs 3.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
How can you tell Red Coral from Rhodochrosite?
Both sit near Mohs 3.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Rhodochrosite feels noticeably heavier for its size (specific gravity 3.65 versus 2.65 for Red Coral). Hold a thin edge to the light: Red Coral is opaque, Rhodochrosite is translucent.
Which is harder, Red Coral or Rhodochrosite?
They are about equally hard, both near Mohs 3.5.
Which is more valuable, Red Coral or Rhodochrosite?
Red Coral is usually the more valuable of the two: a typical collector specimen runs about $300 against $120 for Rhodochrosite, and premium Red Coral can reach $3000 or more.
