mineralogical exhibition of mátra museum
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Mineralogical exhibition of Mátra Museum. Minerals of Miocene rhyolites. Minerals of Miocene rhyolites. 1. Manganese-oxyde. 2. Tridymite (SiO 2 ). 3. Opal (SiO 2 ∙nH 2 O) and Goethite [ a-FeO (OH)]. 4. Opal (SiO 2 ∙nH 2 O) and Nontronite - PowerPoint PPT PresentationTRANSCRIPT
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Manganese-oxyde MnO Class: Oxides and HidroxidesCrystal system: cubicCharacteristic crystal form: aggregate of crystalsHardness: 5,5Cleavage/Fracture: excellent cleavage/conchooidal fractureColour: blackStreak colour: blackGlance: unglazedLocality: Gyngyssolymos
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Tridimite SiO2Class: Oxides and HidroxidesCrystal system: hexagonalCharacteristic crystal form: tabularHardness: 7Cleavage/Fracture: no cleavage/conchooidal fractureColour: whiteStreak colour: Glance: glassy lustreLocality: Gyngyssolymos
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Opal SiO2nH2OClass: Oxides and HidroxidesCrystal system: amorphCharacteristic crystal form: botryoidal, massive, geodeHardness: 5,5 6,5Cleavage/Fracture: no cleavage/conchoidal fractureColour: colourless, white, red, brownStreak colour: whiteGlance: glassy, unglazed, earthy, waxy lustreGoethite -FeO(OH)Class: Oxides and HidroxidesCrystal system: rhombicCharacteristic crystal form: spiky, fibrousHardness: 5 5,5Cleavage/Fracture: excellent cleavage/hooked fractureColour: yellow, brownStreak colour: reddish yellowGlance: diamond lustre, semi-metallic lustreLocality: Gyngyssolymos
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Opal SiO2nH2OClass: Oxides and HidroxidesCrystal system: amorphCharacteristic crystal form: botryoidal, massive, geodeHardness: 5,5 6,5Cleavage/Fracture: no cleavage/conchoidal fractureColour: colourless, white, red, brownStreak colour: whiteGlance: glassy, unglazed, earthy, waxy lustreNontronite [(Na,Ca0,5)0,33(Fe3+,Al)2(Si,Al)4O10(OH)2]nH2OClass: SilicatesSubclass: FillosilicatesCrystal system: monoclinicCharacteristic crystal form: earthy, lamellarHardness: 5 5,5Cleavage/Fracture: excellent cleavage/hooked fractureColour: green, beownish-greenStreak colour: reddish yellowGlance: unglazedLocality: Gyngyssolymos