Cristina Ghinet Sava

Geological Institute of Romania | IGR · Mineralogy

A carbonate-bearing, fluorine-overcompensated fluorapatite (F = 4.42 wt.% as compared with 3.77 wt.% F in the Ca5(PO4)3F end-member), was identified in forsterite-bearing skarns from Valea Rea (N 46°39′48″, E 22°36′43″), located near the contact of the granodiorite laccolith from Budureasa, of Upper Cretaceous Age, with Anisian dolostones. The chem...

A shallow-level monzodioritic to quartz-monzodioritic pluton of the Upper Cretaceous age caused contact metamorphism of Tithonic-Kimmeridgian reef limestones at Măgureaua Vaţei (Metaliferi Massif, Apuseni Mountains, Romania). The preserved peak metamorphic assemblage includes gehlenite (Ak 33.64-38.13), monticellite, wollastonite-2M, Ti-poor calcic...

Phosphogypsum is a technogenic product resulted after the extraction of phosphoric acid from raw phosphate (apatitic) rock by nitric or sulfuric leaching. In Romania, huge stacks of phosphogypsum resulted from sulfuric leaching are located at Valea Călugărească (56 ha), Turnu Măgurele (64 ha), Năvodari (48 ha) and Bacău (20 ha). The chemistry of di...

A shallow-level dioritic pluton of Upper Cretaceous age caused extensive contact metamorphism of a Mesozoic calcareous sequence at Oraviţa-Ciclova in Romania. The peak metamorphic assemblage (stage I) includes wollastonite, åkermanite-rich melilite, Ti-rich calcic garnet, and pyrrhotite. A second, subsequent paragenesis (stage II) is due to local d...

In the Banat area, the contact metamorphism is related to various shallow level magmatic intrusions of Upper Cretaceous age, that lead in the Ciclova – Oraviţa zone to the formation of some particular, high-temperature calc-skarns deposits. Gehlenite-bearing skarns occur at the very contact between dioritic or monzodioritic bodies and carbonaceous...

Wollastonite from three occurrences of high-temperature skarns in Romania: Măgureaua Vaţei (MV), Cornet Hill (CH) and Oraviţa (Or), was investigated from crystal-chemical and crystallographical point of view, in order to assay its use as industrial mineral. In all cases, wollastonite-2M occurs in gehlenite-bearing skarns within the contact between...

Phosphogypsum is a technogenic product remaining after the extraction of phosphoric acid from raw phosphate, mainly apatite. The phosphate rock mainly composed of apatite, and originating from Morocco, Russia, Syria, Jordan and India, is treated with concentrated sulfuric acid (96%), after fine crushing to supra colloidal size and passing into an a...

Insignificant in terms of mineralization, the skarns of Oravita are scientifically interested because of their mineralogical associations. The higher crystallinity and good natural conditions (they are generally barren) are two characteristics of this rocks that can provide the ideally system to understand the behavior of the mineralogical componen...

Phosphogypsum is a technogenic product remaining after the extraction of phosphoric acid from raw phosphate, mainly apatite. The original phosphate rock contains large amounts of REE, mainly replacing Ca from apatite or included in other phosphate structures. About 70% of the REE contents are stacked in the phosphogypsum obtained after sulfuric att...

Gehlenite is a common mineral in three high-temperature calcic skarns in Romania: Magureaua Vatei and Cornet Hill in Apuseni Mountains and Oravita in Banat. In all three occurrences, a gehlenite zone occurs within the contact between dioritic or monzodioritic bodies of Upper Cretaceous age and carbonaceous sequences of Mesozoic age. The melilite so...