Indigo Gabbro
Gabbro (MaFIC intrusive rock)
igneous
Category
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Epidote (Unakite component) / Green Quartzite
Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Gneiss
Metamorphic Gneiss
metamorphic
Quartz–feldspar–mica metamorphic rock, likely gneiss
Gneiss; composition commonly quartz (SiO₂), feldspars, biotite/hornblende, and minor accessory minerals
metamorphic
River Rock
Silica-rich water-worn rock
sedimentary
Likely gray granite fragment
Granite, composed mainly of quartz, feldspar, and mica
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Aggregate Concrete
Anthropogenic Conglomerate (Technosol)
sedimentary
Dark gray basalt or andesite cobble
Fine-grained mafic to intermediate volcanic rock; commonly plagioclase feldspar, pyroxene, and possibly olivine
igneous
Basalt with Olivine Phenocrysts
Aphanitic Mafic Volcanic Rock (Basalt)
igneous
Granite / Diorite Xenolith or Contact
Felsic-Mafic Intrusive Igneous Rock
igneous
Coarse-grained Granite
Phaneritic Granite (contains Quartz, Feldspar, and Mica)
igneous
Gneiss
Gneiss
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Graphic Granite
Pegmatitic Granite (Quartz and Microcline K-Feldspar mixture)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt containing Zeolite or Quartz (SiO2/Silicates)
igneous
Serpentine (Serpentinite)
Hydrous magnesium iron silicate, (Mg,Fe)3Si2O5(OH)4
metamorphic
Amygdaloidal Basalt with Epidote
Vesicular Basalt with secondary Epidote/Quartz mineral infill
igneous
Schist (Greenschist / Mica Schist)
Metamorphic rock rich in platy minerals (e.g., Chlorite/Mica schist)
metamorphic
Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
man-made composite (lithified equivalent of sedimentary)
Limonite/Goethite nodule
Goethite (FeO(OH)) with Hydrated Iron Oxides
mineral
Chalcedony (Grey/White Agate)
Silicon Dioxide (SiO₂)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
River Pebble (Sandstone)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Porphyritic Granite pebble (or Porphyry)
Porphyritic Plutonic Igneous Rock (Granite / Monzonite porphyry)
igneous
Agate with Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Sandstone
Arenicola (comprising mostly Quartz, SiO2)
sedimentary
Green Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Silicon dioxide (SiO2)
Sedimentary
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Veined Basalt River Stone
Basalt with Calcite or Quartz veining
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Sparkling Druzy Quartz on Matrix
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Amygdaloidal Rhyolite
Amygdaloidal felsic extrusive rock
igneous
Porphyry
Porphyritic igneous rock
igneous
Feldspar
Potassium Feldspar (KAlSi3O8)
mineral
Granite with Tourmaline or Biotite
Phaneritic Igneous Rock (Granoid)
igneous
Rough Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral