Epidota
Epidota is a mineral with formula Ca₂(Al,Fe)₃(SiO₄)₃(OH), in the Silicatos group. This specimen comes from Shalman, Landi Kotal, Khyber District, Khyber Pakhtunkhwa, Pakistán.
Description
Single elongated prismatic crystal with smooth faces and sharp edges. Olive-green colour with golden reflections, vitreous-resinous lustre and partial transparency.
About Epidota
A calcium, aluminium and iron silicate that crystallises in the monoclinic system. Common in contact-metamorphic rocks and in hydrothermal veins. Its characteristic green colour varies with iron content.
About the locality
The Alchuri valley, in Shigar District (Gilgit-Baltistan), is noted for isolated prismatic epidote crystals, with elongated habit and high optical purity.
Technical data
- Catalogue No.
- 0253
- Composition
- Ca₂(Al,Fe)₃(SiO₄)₃(OH)
- Name
- Epidota
- Group
- Silicatos
- Category
- Estélites
- Mine
- Shalman
- District / Municipality
- Landi Kotal
- Province
- Khyber District
- Region
- Khyber Pakhtunkhwa
- Country
- Pakistán
- Size (cm)
- 2.5 x 0.4 x 0.2
- Weight
- 2.4 g
- Etymology
- From the Greek "epidosis", 'increase' or 'addition', in allusion to its relation to the epidotoid group.
- Quality
- Buena
- Value trend
- Estable
Related specimens
- Aerinita (fibrosa) — España
- Allanita ((Ce)) — Pakistán
- Apofilita — India
- Asbesto —
- Atacamita — Chile
- Berilo (Aguamarina) — Pakistán
- Berilo (Aguamarina) — Pakistán
- Boltwoodita — Namibia