Mineralogical exhibition of Mátra Museum

Minerals of Mesozoic basalts – Sirok, Recsk

Minerals of Mesozoic basalts – Sirok, Recsk

1.

Native copper (Cu) and Calcite (CaCO3)

Native copper – Cu

Class: Native elementsSubclass: metallicCrystal system: cubicCharacteristic crystal form: octahedral, hexahedralHardness: 2,5 – 3Cleavage/Fracture: no cleavage/hooked fractureColour: light-rose to cupper-redStreak colour: redGlance: metallic lustre

Calcite – CaCO3

Class: Carbonates, NitratesCrystal system: trigonalCharacteristic crystal form: rombohedral, prismatic, tabularHardness: 3Cleavage/Fracture: excellent cleavage/conchoidal fractureColour: colourless, white, grey, brown, yellowStreak colour: whiteGlance: glassy, pearly lustre

Locality: Sirok

2.

Hematite (Fe2O3)

Hematite – Fe2O3

Class: Oxides and HidroxidesCrystal system: trigonalCharacteristic crystal form: tabular, dipyramidal, rombohedralHardness: 6 – 6,5Cleavage/Fracture: no cleavage/uneven, conchoidal fractureColour: red, grey, blackStreak colour: redGlance: metallic lustre to unglazedLocality: Recsk

Epidote (Ca2(Al,Fe3+)Al2[O∙OH∙SiO4∙Si2O7])

3.

Epidote – Ca2Al3[O*OH∙SiO4∙Si2O7]

Class: SilicatesSubclass: NesosilicatesCrystal system: monoclinicCharacteristic crystal form: prismatic, columnarHardness: 6Cleavage/Fracture: very good cleavage/uneven fractureColour: yellowish green, brownish green, greenish blackStreak colour: whiteGlance: glassy, resinouslustreLocality: Recsk

Laumontite (Ca4[Al8Si16O48]∙18H2O)

4.

Laumontite – CaAl2Si4O12∙4H2O

Class: SilicatesSubclass: NesosilicatesCrystal system: monoclinicCharacteristic crystal form: earthyHardness: 3.-3,5Cleavage/Fracture: good cleavage/uneven fractureColour: colourless, whiteStreak colour: colourless, whiteGlance: glassy, resinouslustreLocality: Recsk

5.

Calcite (CaCO3)

Calcite – CaCO3

Class: Carbonates, NitratesCrystal system: trigonalCharacteristic crystal form: rombohedral, prismatic, tabularHardness: 3Cleavage/Fracture: excellent cleavage/conchoidal fractureColour: colourless, white, grey, brown, yellowStreak colour: whiteGlance: glassy, pearly lustreLocality: Recsk