Vesicular Basalt with Magnetite/Hematite
Mafic Extrusive Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Category
Basalt
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Diabase (Trap Rock)
Diabase (also known as Dolerite)
igneous
Gabbro
Gabbro (mafic intrusive rock)
igneous
Slag (Industrial Glassy Byproduct)
Ferro-silicate Slag
Anthropogenic / Non-Natural
Gabbro
Gabbro
igneous
Granodiorite
Phaneritic Plutonic Granodiorite
igneous
Granodiorite
Granodiorite (calc-alkaline phaneritic igneous rock)
igneous
Quartzite (river pebble) and Gabbro (crushed rock)
Quartzite (metamorphosed Quartz Sandstone, SiO2) and Gabbro (Plagioclase-Clinopyroxene rock)
Metamorphic and Igneous
Greenstone (Metabalt)
Chlorite schist / Altered Basalt
metamorphic
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt with Feldspar phenocrysts
igneous
Flowerstone
Porphyritic Basalt or Porphyritic Andesite
igneous
Greenstone / Greenstone Pebble
Greenschist (metamorphosed basalt or gabbro)
metamorphic
Vesicular Basalt or Scoria
Basalt (extrusive volcanic rock)
igneous
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt with Feldspar Phenocrysts
igneous
Vesicular Basalt (Scoria)
Scoriaceous Basalt (FeMgSiO3-rich)
igneous
Lava Rock with Fabric Impression
Scoria or Basalt with anthropogenic impressions
igneous
Porphyry (Flower Stone)
Porphyry (Andesite or Basalt matrix)
igneous
Veined Basalt River Stone
Basalt with Calcite or Quartz veining
igneous
Greenstone Porphyry
Altered Porphyritic Andesite/Basalt
igneous
Scoria (Red Lava Rock)
Scoria (Vesicular Basalt/Andesite)
igneous
Red Scoria (Lava Rock)
Scoria (Vesicular Basalt/Andesite)
igneous
Greenstone (Metabaltic/Greenschist)
Chlorite schist / Meta-basalt
metamorphic
Basaltic Scoria
Scoria (Vesicular Basalt/Andesite)
igneous
Scoria
Scoria (a vesicular basalt or andesite)
igneous
Basalt (Vesicular or Porphyritic)
Basalt (composed primarily of plagioclase feldspar, pyroxene, and olivine)
igneous
Vesicular Basalt (Scoria)
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Basalt with Plagioclase Phenocrysts (Porphyritic Basalt)
Porphyritic Basalt (primarily Plagioclase Feldspar, Pyroxene, and Olivine)
igneous
Basalt with Plagioclase Phenocrysts (Porphyritic Basalt)
Porphyritic Basalt (primarily SiO2, Al2O3, FeO, MgO, CaO)
igneous
Greenstone / Greenschist
Greenschist facies metamorphic rock
metamorphic
Dyed Agate Slice
Microcrystalline Quartz (SiO2) with artificial pigment
mineral
Chalcedony Geode Fragment
Cryptocrystalline Quartz (SiO2)
mineral
Gabbro
Gabbro (mafic intrusive rock)
igneous
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Labradorite
(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)
mineral
Greenstone
Metabasalt or Greenschist (often contains Chlorite, Actinolite, and Epidote)
metamorphic
Epidote
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Epidosite (Unakite-related)
Epidosite (composed primarily of Epidote and Quartz)
metamorphic
Labradorite
Labradorite (Ca,Na)(Al,Si)4O8
mineral
Epidote (Greenstone)
Calcium aluminum iron silicate hydroxide Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)
metamorphic
Banded Agate (Tumbled)
Agate (Variety of Chalcedony/Quartz), SiO2
mineral
Bauxite
Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)
sedimentary
Greenstone (Greenschist)
Greenschist facies rock (containing chlorite, actinolite, and epidote)
metamorphic