Granate Hesonita (Grosularia)
Granate is a mineral with formula Ca₃Al₂(SiO₄)₃, in the Silicatos (Nesosilicatos) group. This specimen comes from Žulová, Friedeberg, Jeseník, Olomouc, República Checa.
Description
Bright hessonite crystals with good habit and lustre, dark-caramel in colour with an internal red-honey tone. Among them, three black, opaque prisms, discreetly integrated and barely distinguishable to the naked eye. They may be rare-earth-rich epidote (allanite-(Ce)). Under a hand lens, excellent.
About Granate
Hessonite is the ferrous-calcium variety of grossular. Its orange to reddish-brown colour is due to the presence of iron and manganese.
About the locality
Famous since the 19th century for the quality of its hessonites and epidotes.
Technical data
- Catalogue No.
- 0321
- Composition
- Ca₃Al₂(SiO₄)₃
- Name
- Granate
- Variety
- Hesonita (Grosularia)
- Group
- Silicatos (Nesosilicatos)
- Category
- Meritum Persé
- Associations
- allanita-(Ce)
- Mine
- Žulová
- District / Municipality
- Friedeberg
- Province
- Jeseník
- Region
- Olomouc
- Country
- República Checa
- Size (cm)
- 6 x 3 x 2
- Weight
- 70 g
- Ex-collection
- Willfried Kittler
- Etymology
- From the Greek "hēssōn" ('inferior'), because it is less hard than other garnet varieties.
- Quality
- Buena
- Value trend
- Estable
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