The private collection of Constantin Gruescu contains hundreds of valuable mineralogical samples from the Banat mines of Ocna de Fier, Dognecea, Sasca Montană-Ciclova Montană, Armeniş-Teregova, Moldova Nouă, Rusca Montana-Ruşchiţa of the Apuseni Mountains, Baia Mare, Călimani and from different areas of the world. The rare specimens include the Japanese quartz macle, the coaxial macle with double or triple macling, the iron-oligyst of the iron rose type, grossular granates and andradites. The museum is private property, as the collection is displayed in a 10 x 4 m hall built by the owner.
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