Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Category
Not A Rock Or Mineral
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Granite
Granite (Felsic Plutonic Rock)
igneous
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Snowflake Obsidian
Obsidian with Cristobalite inclusions
igneous
Amethyst Geode
Quartz (Silicon Dioxide, SiO2) with iron impurities
mineral
Hag Stone
Perforated sedimentary rock (typically flint, chert, or limestone)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Mafic Volcanic Rock
igneous
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sandstone
Arenite (SiO2 with various cementing minerals)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Granite
Phaneritic Igneous Rock (Granite)
igneous
Serpentine
(Mg,Fe)3Si2O5(OH)4
metamorphic
Petrified Coral Fossil (Honeycomb Coral)
Favosites (Rugosa/Tabulate coral fossil replaced by microcrystalline quartz/chalcedony)
fossil
Dark Igneous Rock (Likely Basalt or Diabase)
Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.
Igneous
Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic
Brown Sandstone (River Rock)
Arenite
sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Vesicular Basalt with Quartz/Chalcedony
Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)
igneous
Quartzite with Feldspar and Mica (Granitic Gneiss Pebble)
Metamorphic Rock / Quartzite / Granitic Gneiss
metamorphic
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Quartz-Veined Sandstone
Quartz-veined Arenite
sedimentary
Quartz Geode
Silicon dioxide (SiO2)
sedimentary
Shale
Sedimentary pelitic rock
sedimentary
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Banded Jasper
Silicon Dioxide with Iron Oxide impurities (SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock
igneous
Mica-rich metamorphic rock, likely schist
Muscovite–biotite schist, possibly with quartz and feldspar
metamorphic
Banded Serpentine
Serpentine group (subgroup Lizardite or Antigorite) - Mg3Si2O5(OH)4
metamorphic
Greenstone
Metabasalt (Greenstone)
metamorphic
Quartz (Orange/Pink variety)
Silicon Dioxide (SiO2)
mineral
Purple Chalcedony
Silicon Dioxide (SiO2)
mineral
Calcite (Honey Calcite and Agate)
Calcium Carbonate (CaCO3)
mineral
Green Apophyllite and Stilbite on Quartz Cluster
Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)
Mineral