Granodiorite
Granodiorite (intermediate plutonic rock)
igneous
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Sandstone with Ironstone Concretion
Arenite with Ferruginous Cement
sedimentary
Porphyry (likely Porphyritic Andesite or Basalt)
Porphyritic Igneous Rock
igneous
Banded Agate
Cryptocrystalline variety of Quartz (SiO2)
mineral
Gneiss
Gneiss (a type of metamorphic rock)
Metamorphic Rock
Digital Multimeter (Synthetic Object)
Digital Multimeter (DMM)
not a rock
Amygdaloidal Basalt with Zeolite/Quartz Infill
Amygdaloidal Basalt (Host: (Mg,Fe)2SiO4 / CaAl2Si2O8; Infill: SiO2 or Na2Al2Si3O10·2H2O)
igneous
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Basalt with Hematite staining
Extrusive mafic igneous rock with Fe2O3
igneous
Basalt
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
igneous
Chert / Flint
Cryptocrystalline quartz (SiO2)
Sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
River Stone (Sandstone or Siltstone)
Sedimentary Rock (Clastic)
sedimentary
Vesicular Basalt with Siltstone
Mafic Volcanic Rock (Basaltic Composition)
igneous
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)
igneous
Quartzite Pebble
Quartzite (SiO2) with mineral inclusions
metamorphic
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Obsidian
Volcanic Glass (SiO2)
igneous
Dalmatian Stone
Peralkaline Feldsphathic Igneous Rock
igneous
Lapis Lazuli
Lapis Lazuli (Complex aggregate mainly of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
![Lapis Lazuli (Na8[Al6Si6O24]S2 (Lazurite component), a rock composed primarily of Lazurite, Calcite, and Pyrite) — metamorphic](https://media.rockidentification.com/f914c118-fe45-4316-a33a-49fa9c50cbe7-thumbnail.jpg)
Lapis Lazuli
Na8[Al6Si6O24]S2 (Lazurite component), a rock composed primarily of Lazurite, Calcite, and Pyrite
metamorphic
Lapis Lazuli
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Gneiss
Foliated Metamorphic Rock
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock including secondary mineral infills)
Igneous
Sandstone
Arenite (SiO2 based typically)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Silicon dioxide (SiO2) - Pseudomorph after crocidolite
mineral
Quartz pebble with surface markings
Silicon Dioxide (SiO2)
mineral
Chalcedony (Common Agate)
Silicon Dioxide (SiO2)
mineral
Quartz / Common Agate
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Quartz (SiO2) in metamorphic host rock (likely schist or phyllite)
metamorphic
Sandstone (Ferruginous)
Arenite with Iron Oxide matrix
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Plume Agate
Silicon Dioxide (SiO2)
mineral
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
mineraloid
Gneiss (with Quartzite layers)
Gneissic Metamorphic Rock
metamorphic
Milky Quartz with Mineral Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Vein in Rhyolite
Silicon Dioxide (SiO2) in extrusive igneous rock
igneous
Granitic Pegmatite (with Smoky Quartz and Mica)
Granitic Pegmatite (composed of SiO2, KAl2(AlSi3O10)(OH)2, and (K,Na)(AlSi3O8))
igneous
Schist
Mica Schist
metamorphic