Abstract
In the paper has been analyzed the crystal structure of a celestine sample from Valea Sarii (Vrancea region, Romania) located in the Eastern Carpathians Foredeep. The celestine sample was also studied by optical microscopy, chemical and thermal analysis. The unit cell parameters of the celestine structure refined in the space group Pnma were: a=8.39769 �, b=5.38415 �, c=6.88167 �, Z=4. The chemical composition of the celestine crystals was determined by EDX analysis. The optical characteristics of the sample were studied by optical microscopy. A new set of the unit cell parameters and fractional coordinates of the celestine crystal structure were determined. Also were determined the bond lengths in the Sr-O12 and SO4 polyhedra. The sample was collected in the massive mineralization area of the Valea Sarii ore deposit, the largest celestine ore deposit in Romania.
Highlights
In the Earth’s crust there are two important natural sources for strontium salts: celestine (SrSO4) and strontianite (SrCO3)
A “celestine impregnationwas identified in the gypsum blocks, in secondary carbonatites blocks and in the breccia matrix in all outcrops located in the Valea Sarii-Andreiasu alignment (Vrancea region)
The unit cell parameters of the celestine crystals resulted in the refinement were: a=8.39769 Å, b=5.38415 Å, c=6.88167 Å, Z=4
Summary
In the Earth’s crust there are two important natural sources for strontium salts: celestine (SrSO4) and strontianite (SrCO3). Celestine ore deposits are more widespread than the strontianite ones, and have become the main raw source for the production of strontium salts with great economic value. The average celestine content determined in the samples collected in the outcrops and in the research drilling executed in the area was 576.84 g per tons. A “celestine impregnationwas identified in the gypsum blocks, in secondary carbonatites blocks and in the breccia matrix in all outcrops located in the Valea Sarii-Andreiasu alignment (Vrancea region). Mineralogical analyses of the heavy minerals concentrate, separated from the samples collected from both the gypsum blocks and the breccia matrix in the Valea Sarii ore deposit, were evidenced by an association of authigene minerals which includes celestine, sulfides, fluorite, and clear sphalerite [4]
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