Rhodochrosite vs Siderite
| Property | Rhodochrosite | Siderite |
|---|---|---|
| สูตรเคมี | MnCO3 | FeCO3 |
| ระบบผลึก | Trigonal | Trigonal |
| หมวดหมู่แร่ธาตุ | 05 Carbonates and Nitrates | 05 Carbonates and Nitrates |
| ความแข็งโมห์ส | 3.5-4.0 | 3.5-4.5 |
| สี | Rose-red, pink, brown, gray | Yellowish-brown, gray, brown, greenish |
| ความวาว | Vitreous | Vitreous |
| สีเส้นขูด | White | White |
| ความโปร่งใส | Translucent | Translucent |
| การแตกเรียบ | Perfect rhombohedral {1011} | Perfect rhombohedral {1011} |
| รอยแตก | Conchoidal to uneven | Conchoidal |
Key Differences
- ◆ Siderite is iron carbonate (FeCO3); rhodochrosite is manganese carbonate (MnCO3) — isostructural trigonal carbonates.
- ◆ Rhodochrosite is rose-red to pink; siderite is yellowish-brown to gray.
- ◆ Both form rhombohedral crystals with curved faces and react with dilute HCl.
- ◆ Siderite is an iron ore; rhodochrosite is primarily a collector's gem mineral.
- ◆ Siderite (specific gravity 3.83–3.96) is slightly denser than rhodochrosite (3.45–3.70).