Bedded tuff with two piles of volcanic ash
Tuff
Lapilli, lava droplets
Volcanic crater
Layers of volcanic ash in rock
New island formed by Hunga Tonga volcano, 2017
Solidified volcanic ash
Summit crater of Hverfjall volcano, Iceland
Tephra surface of Hunga Tonga窶滴unga Ha'apai island
View of small volcanic ash mud-flows on snow
Sample of basalt
Tuff specimen
Volcanic ash, SEM
Tuff rock with graded bedding
Bentonite clay mound, Arizona, USA
Volcanic ash
Sample of granite
Volcanic rocks
Muscovite and feldspar
Paragneiss, light micrograph
Paragneiss
Heavily weathered kimberlite
Agglomerate rock, polarised LM
Polished sphere of orbicular jasper
Polished sphere of ocean jasper
Muscovite, polarised light micrograph
Nyamulagira volcano, Congo
Volcanic cone, Iceland
Tuff volcanic rock and mineral deposits
Sample of biotite
Zoisite in pegmatite groundmass
Rhyolitic tuff, polarised light micrograph
Rock mineral crystals, polarised LM
Brazilianite crystals in calcite
Muscovite mineral sample
Basaltic dyke rock
Fuchsite mineral stone
Cut and polished septarian nodule
Mica schist folds, light micrograph
Tenorite mineral crystals
Emeralds
Granite
Zeophyllite
Pectolite
Andesite
Apophyllite
Blue Hauyne crystals in lava groundmass
Tabular muscovite crystals and apatite
Biotite in rock groundmass
Sanidine on trachyte lava groundmass
Lepidolite in pegmatitic groundmass
Pink-white chabazite in basalt groundmass
Muscovite crystals in rock groundmass
Rhyolite, light micrograph
Rhyolite
山形県 高畠町 瓜割石庭公園
山形県 瓜割石庭公園
Fjardara Canyon
Rio Blanco, Chaiten, Chile
Welded Tuft
Volcanic eruption
Volcano above Heimaey, Iceland
阿蘇砂千里ヶ浜
阿蘇火山
阿蘇草千里ヶ浜登山ルートからみえる景色
Ash layers in volcanic peak
Biotite
Badlands, John Day National Monument, USA
有珠山噴火で壊された工場
Volcanic eruption, Reunion Island
Dolerite rock crystals, polarised LM
Iceland, Thorsmoerk, broken lava rock
Limburgite
Snowflake obsidian
Brazilianite crystals
Aquamarine columnar crystals
Sample of andesite
Sample of muscovite
Mahogany obsidian
Obsidian
Obsidian flow
Obsidian specimen
Two-mica granite
Rhyolite mountain, Iceland
Reddish pink apophyllite crystal and basalt groundmass
Niobite in host rock
Niobite crystal
Analcime crystal group
Pyroclastic rock
Amygdaloidal basalt
Amphibolite, light micrograph
Orthogneiss, light micrograph
Quartz phyllite, light micrograph
Quartz phyllite
Septarian nodule
Manganese oxide, dendritic form
Pumice lava, SEM
Pumice from Mt St Helens (USA), SEM
Slate quarry waste
Lomagnupur cliff, Iceland
Sample of shale
Sample of gneiss
Samples of sandstone
Flint
Breccia Sanguigna marble
Breccia Coallina Rosa marble
Sedimentary structures in sandstone