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 and joined the Terrium collection in 2025.
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
- Acquired
- 2025
- 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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- Forsterita (Grupo del Olivino | Fayalita-Forsterita) — España
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