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.
Rhodochrosite properties at a glance
| Type | Carbonates |
|---|---|
| Chemical formula | MnCO3 |
| Mohs hardness | 3.75 |
| Crystal system | trigonal |
| Luster | vitreous |
| Streak | White |
| Cleavage | Perfect rhombohedral |
| Fracture | Uneven |
| Specific gravity | 3.65 |
| Transparency | translucent |
| Common colors | Pink, Rose red, Red, Orange, Brown |
| Rarity | uncommon |
Geology & background
Rhodochrosite forms in hydrothermal veins with other manganese and metal minerals, and also as a secondary mineral and as banded crusts in cavities of manganese-bearing deposits.
Rhodochrosite has been valued as an ornamental stone since antiquity, with banded material in South America linked to Inca-era mining, and it is now the state mineral of Colorado.
How to identify Rhodochrosite
- Look for rose-pink to red color, either as rhombohedral crystals or banded pink-and-white masses.
- Rhodochrosite is moderately soft, has a perfect rhombohedral cleavage, and effervesces in warm acid.
- Its distinctive pink color and carbonate behavior help separate it from similar minerals.
Where Rhodochrosite is found
Rhodochrosite occurs in hydrothermal veins and manganese deposits worldwide, with notable specimen localities in Argentina, the United States, Peru, South Africa, Mexico, and Romania.
How much is Rhodochrosite worth?
| Entry-level specimen | $15 |
|---|---|
| Typical collector specimen | $120 |
| Premium specimen | $900+ |
Value depends on color, transparency, crystal form, banding, size, locality, and overall condition.
Common uses
- Cabochons and ornamental stone
- Jewelry
- Carving and decorative objects
- Minor ore of manganese
- Collector specimens
Interesting facts
- The name rhodochrosite comes from Greek words meaning rose-colored.
- Banded pink-and-white rhodochrosite from Argentina is sometimes called Inca rose.
- Transparent red crystals from Colorado are among the most prized mineral specimens in the world.
- Rhodochrosite effervesces in warm acid like other carbonates and has a perfect rhombohedral cleavage.
Care & safety
Rhodochrosite is moderately soft with perfect cleavage, so crystals chip and scratch easily.
Avoid inhaling dust. Do not cut, grind, or polish unknown specimens without eye protection and a proper respirator.
