Scolecite
| Colour | White, Clear, Pink, Red |
|---|---|
| Mohs hardness | 5 to |
| Lustre | Vitreous, silky when fibrous |
| Streak | White |
| Crystal system | Monoclinic |
| Transparency | Transparent to translucent |
| Cleavage | Perfect on and {{mset|10}} |
| Fracture | Irregular/uneven |
| Chemical formula | CaAl 2 Si 3 O 10 ·3H 2 O |
| Specific gravity | 2.16 to 2.40 |
What is Scolecite?
Scolecite is a tectosilicate mineral belonging to the zeolite group; it is a hydrated calcium silicate, CaAl2Si3O10·3H2O. Only minor amounts of sodium and traces of potassium substitute for calcium. There is an absence of barium, strontium, iron and magnesium. Scolecite is isostructural (having the same structure) with the sodium-calcium zeolite mesolite and the sodium zeolite natrolite, but it does not form a continuous chemical series with either of them. It was described in 1813, and named from the Greek word, σκώληξ (sko-lecks) = "worm" because of its reaction to the blowpipe flame.
How to identify Scolecite
- Lustre: Vitreous, silky when fibrous.
- Hardness: Mohs 5 to — soft; a knife will scratch it.
- Streak: White.
- Habit: Monoclinic crystal system.
Scolecite in different forms
Stones often confused with Scolecite
Frequently asked questions
How hard is Scolecite?
Scolecite is Mohs 5 to on the hardness scale.
What colour is Scolecite?
Scolecite is typically white, clear, pink, red (Colorless white, pink, salmon, red or green).