Basalt
Basalt (primarily composed of Plagioclase Feldspar and Pyroxene)
igneous
Category
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Black Beauty Meteorite
NWA 7034 (Northwest Africa 7034)
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Mineral within Sedimentary Rock
Granite
Granite (Intrusive Igneous Rock)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (Silicon Dioxide, SiO2)
sedimentary
Agate Geode
Silicon Dioxide (SiO2) - Banded Chalcedony with Quartz
mineral
Granite
Granite (Felsic Intrusive Igneous Rock)
igneous
Laterite (Iron-rich bauxite or Gossan)
Ferricrete (Fe2O3·nH2O)
sedimentary
Basalt River Pebble (with possible Pyrite/Mineralization)
Basalt (Mafic volcanic rock)
igneous
Fossilized tooth or tooth fragment
Indeterminate vertebrate tooth; likely mammalian, mineralized hydroxyapatite
fossil
Lava Rock (Basaltic Scoria)
Vesicular Basalt
igneous
Clear Quartz Crystal
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in Geode form
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Weathered granite or granitic gneiss
Granite; primarily quartz, feldspar, and mica (exact identification uncertain from the photo)
igneous
Sandstone (likely Arkosic)
Arenite (SiO2 with KAlSi3O8)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Fulgurite
Fulgurite (Lechatelierite/Silica glass)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Siltstone Concretion
Carbonate-cemented Siltstone Concretion
sedimentary
Red Jasper with Quartz Veining
Jasper (Silicon Dioxide, SiO2) with Quartz (SiO2) inclusions
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Tumbled pale stone, likely milky quartz or calcite
Quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing
mineral
Granite Cobble
Felsic Intrusive Igneous Rock (Granite)
igneous
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Epidotite (Unakite-related)
Epidote-rich rock
metamorphic
Greenstone / Epidosite
Epidosite (primary minerals: Epidote and Quartz)
metamorphic
K2 Jasper (Beads)
Granodiorite with Azurite and Malachite
igneous
Banded metamorphic rock, likely mica schist or gneiss
Quartz–feldspar–mica schist/gneiss; exact identification requires a fresh surface and mineral tests
metamorphic
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Yellow Jasper / Chalcedony
Silicon Dioxide (SiO2) with iron inclusions
mineral
Sandstone (Quartzose)
Sandstone (clastic sedimentary rock, primarily SiO2)
sedimentary
Chrysocolla in Matrix
Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
mineraloid