Mineral, Often A Rock Given Its Aggregate Nature

Watermelon Tourmaline in Quartz Matrix

Elbaite (complex Borosilicate) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4

Basalt

Basalt (Mafic Extrusive Igneous Rock)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Granite

Phaneritic Felsic Igneous Rock

Orange Quartzite (River Pebble)

Quartzite (primarily SiO2)

Amygdaloidal Basalt

Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)

Chert (Iron-Stained)

Microcrystalline Quartz (SiO2)

Sandstone (Beach Pebble)

Clastic sedimentary rock (primarily Quartz and Feldspar)

Basalt (River Pebble)

Basalt (Mafic Extrusive Igneous Rock)

Banded Chert (or Flint)

Microcrystalline Quartz (SiO2)

Asphalt (Road Aggregate)

Bituminous Conglomerate / Asphalt Concrete

Sandstone (Greywacke/Siltstone variant)

Clastic Sedimentary Rock (composed primarily of Quartz SiO2 and Feldspar)

Geode (Unopened)

Silicon Dioxide (SiO2) in sedimentary vugs

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Moss Agate and Druzy Quartz Carving

Cryptocrystalline Silica (SiO2) with impurities

Banded Calcite (Green Onyx)

Calcium Carbonate (CaCO3)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Granite

Granite (Phaneritic intrusive igneous rock; primarily SiO2 and Al2O3)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Sandstone (Wonderstone)

Arenite (composed primarily of SiO2 with Fe2O3 impurities)

Sandstone (with Limonite staining)

Arenite (primarily SiO2 with FeO(OH)·nH2O)

Calcite Geode

Calcium Carbonate (CaCO3)

Andesite Porphyry

Porphyritic Andesite

Limonite Concretion (Ironstone)

Limonite (FeO(OH)·nH2O) / Goethite

Schist

Mica Schist

Sandstone (Quartz-rich)

Arenite (SiO2 based)

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Pumice

Vesicular volcanic glass

Red Sandstone

Arenite (primarily Quartz SiO₂ with Hematite Fe₂O₃ staining)

Emerald In Matrix

Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium

Granite

Phaneritic Granocrystalline Igneous Rock

Quartzite with inclusions

Metamorphic Rock (Mainly SiO2)

Quartz in Limonite-rich Matrix

Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O

Druzy Quartz on Vesicular Basalt

Silicon Dioxide (SiO2) in an extrusive Mafic igneous host rock

Sandstone Pebble

Arenite (primarily SiO2)

Sandstone (likely Quartz Sandstone)

Arenite (SiO2 based)

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Dalmatian Stone

Dalmatian Jasper (Aplitic Rock)

Ferruginous Sandstone (Gozzan/Ironstone)

Arenite with Limonite/Goethite cement (FeO(OH)·nH2O)

Fluorite (Rainbow or Multi-colored Fluorite)

Fluorite (Calcium Fluoride - CaF2)