Basalt with Weathering Rind
Mafic Volcanic Rock (Primarily Plagioclase and Pyroxene)
igneous
Category
Minerals
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Amygdaloidal Basalt
Amygdaloidal Mafic Volcanic Rock (Basalt)
igneous
Vesicular Basalt with Zeolite
Mafic volcanic rock with Hydrated Aluminosilicate minerals (Zeolite group)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Basalt with Vesicles
Vesicular Basalt (Mafic Extrusive)
igneous
Orthoclase Feldspar
K(AlSi3O8)
mineral
Basalt with Chert/Obsidian blade
Aphanitic Mafic Igneous Rock (Basalt) with Microcrystalline Silica (Chert)
igneous
Quartz (Orthoquartzite)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Ferruginous Sandstone
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH))
sedimentary
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions
igneous
Labradorite
Labradorite ((Ca,Na)(Al,Si)4O8)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Greenschist
Chlorite schist
metamorphic
Red Sandstone
Arenite (high iron oxide content)
sedimentary
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
River Cobble (likely Basalt or Metagraywacke)
Non-specific water-worn lithic fragment
igneous or metamorphic
Tufa
Calcareous Tufa (CaCO3)
sedimentary
Red Sandstone
Arenite with Hematite (Fe2O3)
sedimentary
River Pebble Gravel
Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)
sedimentary
Chert (and/or River Pebble)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Flint Pebbles)
Microcrystalline quartz (SiO2)
sedimentary
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz (with trace inclusions)
Silicon Dioxide (SiO2)
mineral
Leopard Skin Jasper
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Greenstone
Greenschist
metamorphic
Porphyritic Basalt (with Pyrolusite or Iron-oxide staining)
Porphyritic Basalt (Mafic Extrusive)
igneous
Golden Healer Quartz
Ferruginous Quartz (SiO2 with Fe2O3 inclusions)
mineral
Unakite
Epidotized Granite
metamorphic
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide with Iron Oxide (SiO2 with traces of Fe2O3/FeO(OH))
mineral
Chert (Brecciated or Veined)
Silicon Dioxide (SiO2)
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Silica (SiO2)
sedimentary
Chert (often called Flint or Jasper based on color)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous