Publication details
Velké krystaly nitridu titanu (osbornitu) v metalurgické strusce z kladenských oceláren
| Title in English | Large titanium nitride (osbornite) crystals in the metallurgical slag from Kladno steel-works (Czech Republic) |
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| Authors | |
| Year of publication | 2024 |
| Type | Peer-reviewed scientific article |
| Magazine / Source | Geoscience Research Reports |
| MU Faculty or unit | |
| Citation | |
| web | https://app.geology.cz/zgv/en/detail/zpravy.geol.2024.09# |
| Doi | https://doi.org/10.3140/zpravy.geol.2024.04 |
| Keywords | Kladno; Raman spectroscopy; slag; TiN; osbornite; EMPA |
| Description | Large crystals of titanium nitride (mineral osbornite) from metallurgical slag were studied by EMPA, XRD and Raman spectroscopy. The sample was collected at metallurgical dump in Kladno in the early 1970s and briefly described by Žáček and Ondruš (2003). The sample has a size of about 40 × 30 × 30 mm and is notable for its high density and conspicuous cubes of copper-like red to gold colour with metallic lustre (Fig. 1–2). The material consists of dominant gehlenite (~ 65% of the sample, all vol. %), osbornite (~ 20%), metallic iron (~ 8%), oldhamite (~ 5%), spinel (~1%) and anorthite (~1%), see Fig 3. All these phases were analyzed with the Cameca SX100 electron microprobe, and osbornite by Raman spectroscopy. Gehlenite and osbornite were also confirmed by XRD (Žáček – Ondruš 2003). Gehlenite contains a low concentration of MgO (0.8–1.1 wt.%) and traces of Na2O (0.06–0.16 wt.%) and Fe2O3 (0.4 wt.%). Aggregates of metallic iron embedded in gehlenite contain low titanium (up to 0.06 wt.% Ti) and elevated phosphorus concentrations (0.53–1.59 wt.% P), whereas tiny iron inclusions embedded in osbornite are richer in titanium (1.31 wt.%) and poorer in P (0.37 wt.%). Oldhamite, a cubic CaS, forms rounded inclusions 20–150 µm in size embedded in massive gehlenite. It is characterized by elevated concentration of Mn (2.7 wt.%) and low Fe (0.3 wt.%) and Mg (0.15 wt.%). Spinel has empirical formula Mg0.98Al1.99O4, and plagioclase is pure anorthite. Compositional data of osbornite are given in Table 1, those of associated minerals in Table 2 and 3. |