Minerals
TopGeneral Information
Aragonite is one of the two natural calcium carbonate minerals. (The other one is calcite.) Aragonite grows in the form of pillars or needles. Aragonite is formed at low temperatures and can therefore be found in caves, hot springs, shellfish shells or as oolites on the bottom of shallow seas.[1]
TopChemical & Physical Information
| Trivial Name | Aragonite |
| Chemical Name | Calcium Carbonate |
| Chemical Formula | CaCO3 |
| Density | 2,94 g·cm-3 |
| Molar mass | ? |
| Hardness | 3,5-4 |
| Crytal system | Orthorombic and hexagonal |
| Unit cell | ? |
| Crystal habit | ? |
| Fracture | Conchoidal |
| Cleavage | Distinct on [010] |
| Colour | White, red, yellow, orange, green, bleu and brown. |
| Luster | Glass, dull |
| Streak | White |
| Opacity | Transparent to translucent. |
| Safety | Safe |
| Extra | Turns into calcite due to thermodynamic instability. |
Photos
(2 cm)
Sources
[1] Wikipedia
[2] Specimen from my personal collection, photo taken by me.
