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Mineralogical exhibition of Mátra Museum
Minerals of Mesozoic basalts – Sirok, Recsk
1. Native copper (Cu) and Calcite (CaCO 3 )
Native copper – Cu Class: Native elements Subclass: metallic Crystal system: cubic Characteristic crystal form: octahedral, hexahedral Hardness: 2,5 – 3 Cleavage/Fracture: no cleavage/hooked fracture Colour: light-rose to cupper-red Streak colour: red Glance: metallic lustre Calcite – CaCO 3 Class: Carbonates, Nitrates Crystal system: trigonal Characteristic crystal form: rombohedral, prismatic, tabular Hardness: 3 Cleavage/Fracture: excellent cleavage/conchoidal fracture Colour: colourless, white, grey, brown, yellow Streak colour: white Glance: glassy, pearly lustre Locality: Sirok
2. Hematite (Fe 2 O 3 )
Hematite – Fe 2 O 3 Class: Oxides and Hidroxides Crystal system: trigonal Characteristic crystal form: tabular, dipyramidal, rombohedral Hardness: 6 – 6,5 Cleavage/Fracture: no cleavage/uneven, conchoidal fracture Colour: red, grey, black Streak colour: red Glance: metallic lustre to unglazed Locality: Recsk
Epidote (Ca 2 (Al,Fe 3+ )Al 2 [O∙OH∙SiO 4 ∙Si 2 O 7 ]) 3.
Epidote – Ca 2 Al 3 [O*OH∙SiO 4 ∙Si 2 O 7 ] Class: Silicates Subclass: Nesosilicates Crystal system: monoclinic Characteristic crystal form: prismatic, columnar Hardness: 6 Cleavage/Fracture: very good cleavage/uneven fracture Colour: yellowish green, brownish green, greenish black Streak colour: white Glance: glassy, resinouslustre Locality: Recsk
Laumontite (Ca 4 [Al 8 Si 16 O 48 ]∙18H 2 O) 4.
Laumontite – CaAl 2 Si 4 O 12 ∙4H 2 O Class: Silicates Subclass: Nesosilicates Crystal system: monoclinic Characteristic crystal form: earthy Hardness: 3.-3,5 Cleavage/Fracture: good cleavage/uneven fracture Colour: colourless, white Streak colour: colourless, white Glance: glassy, resinouslustre Locality: Recsk
5. Calcite (CaCO 3 )
Calcite – CaCO 3 Class: Carbonates, Nitrates Crystal system: trigonal Characteristic crystal form: rombohedral, prismatic, tabular Hardness: 3 Cleavage/Fracture: excellent cleavage/conchoidal fracture Colour: colourless, white, grey, brown, yellow Streak colour: white Glance: glassy, pearly lustre Locality: Recsk
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