SEKANINAITE - Dolní Bory, Czech Republic | TL- type locality | SYSTEMATIC | 48 x 33 x 26 mm
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Mineral: SEKANINAITE
Locality: Dolní Bory, Bory, Žďár nad Sázavou District, Vysočina Region, Czech Republic (type locality)
Dimension (mm): 48 x 33 x 26 mm
Weight (gr): 42 gram
Description / Notes: A glassy crystalline mass specimen suitable as a representative for a collection of systematics. Sekaninaite forms blue-violet glassy to matte imperfect crystals. It is formed magmatic in granitic pegmatites or granites, metamorphic in gneisses and migmatites. This is a specimen from the type locality Dolní Bory, other occurrences are on Elba in Italy.
- Formula:(Fe,Mg)2Al3(AlSi5O18)
- Colour:grayish-blue to bluish-violet
- Lustre:Vitreous
- Hardness:7 - 7½
- Specific Gravity:2.76 - 2.77
- Crystal System:Orthorhombic
- Name:Named in honor of Josef Sekanina (4 September 1901, Knínice u Boskovic - 28 November 1986, Letovice), Czech mineralogist who first found the mineral.
- Type Locality:Pegmatite vein No. 4, Dolní Bory, Bory, Žďár nad Sázavou District, Vysočina Region, Czech Republic
- IMA Status: Approved IMA 1975
Further information in mineralogy databases
- 9.Silicates
- Sekaninaite
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