Taseqite
A variety of Minerals
What is Taseqite?
Taseqite is a rare mineral of the eudialyte group, with formula Na12Sr3Ca6Fe3Zr3NbSiO(Si9O27)2(Si3O9)2(O,OH,H2O)3Cl2. The formula given is derived from the original one and shows a separate silicon at the M4 site, basing on the nomenclature of the eudialyte group. Taseqite, khomyakovite and manganokhomyakovite are three group representatives with species-defining strontium, although many other members display strontium diadochy. Both strontium (Sr) and niobium (Nb) are essential in the crystal structure of taseqite. When compared to khomyakovite, taseqite differs in niobium- and chlorine-dominance.
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Key Characteristics
Formation of Taseqite
Taseqite's type locality is the Taseq slope located in the Ilimaussaq complex, Greenland - hence its name. At the type locality taseqite occurs in albitite veins, together with aegirine, analcime, catapleiite, ferrobustamite, hemimorphite, pectolite (silicates); ancylite-(La), calcite, dolomite, strontianite (carbonates); fluorapatite, and sphalerite. Taseqite was found also in Odichincha massif in association with nepheline, alkaline feldspar, aegerine and lamprophyllite.
Quick Facts
Physical Properties
- Color
- dark brown to yellowish brown, lemon yellow
- Hardness (Mohs)
- 5.5
- Density
- 3.24 g/cm³
- Streak
- brownish white
Chemical Properties
- Chemical Formula
- Na12Sr3Ca6Fe3Zr3Nb[(Si3O9)2(Si9O27)2SiO]Cl2(O,OH,H2O)3
- Elements
- Ca, Cl, Fe, H, Na, Nb, O, Si, Sr, Zr

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