Antropogenic Rock (Man Made)

Red Sandstone

Sandstone (principally Quartz with Iron Oxide coating)

Fish Fossil in Limestone

Lycoptera (likely) in Micritic Limestone

Quartz-veined Basalt

Amygdaloidal or Porphyritic Basalt with Silicon Dioxide (SiO2) vein

Yellow Chert or Jasper

Microcrystalline Quartz (SiO2)

River Pebble (Quartz/Jasper)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Fossiliferous Chert with Brachiopod Impression

Chert (SiO2) containing Brachiopoda fossil remains

Gneiss (Pebble)

Gneiss

Chert (Yellow/Tan Variety)

Chert (SiO2)

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Slate with Quartz Vein

Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)

Shale

Fissile mudrock (composed of clay-sized particles and detrital grains)

Unakite

Epidotized Granite

Quartzite River Rock

Quartzite (primarily SiO2)

Sandstone or Quartzite

Arenite (if sedimentary) / Quartzite (if metamorphic)

Sandstone (Glacial Cobble)

Arenite / Sedimentary Rock (primarily SiO2)

Quartz Geode

Silicon Dioxide (SiO2) in Geode form

Sandstone (with Iron Staining)

Clastic sedimentary rock (SiO2 with Fe2O3 oxides)

Vesicular Basalt with Epidote

Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Quartzite with Hematite staining

Quartzite (SiO2) with iron oxide inclusions

Quartzite (River Pebble)

Meta-quartzite (composed primarily of SiO2)

Yellow Quartzite (River Pebble)

Quartzite (primarily Silicon Dioxide, SiO2)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite, rich in Potassium Feldspar)

Quartz Druzy (on Matrix)

Silicon Dioxide (SiO2)

Dalmatian Jasper / Dalmatian Stone

Peralkaline Rock (Silicon Dioxide with Amphibole inclusions)

Quartzite

Quartzite (primarily SiO2)

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4

Sandstone (Ferruginous)

Arenite with Iron Oxide (Limonite/Hematite) coating

Milky Quartz

Quartz (Silica / Silicon Dioxide), SiO2

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Shale

Fissile Siliciclastic Sedimentary Rock

Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Agate (specifically a Yellow/Honey Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Unknown Rock Specimen

Granodiorite or Diorite

Granodiorite / Diorite

Quartz in Matrix (possibly Basalt or Siltstone host)

Silicon Dioxide (SiO2) in Host Rock

Quartz-veined Mudstone or Argillite

SiO2 (Quartz) in Siltstone/Mudstone matrix

Quartz (Druzy)

Silicon Dioxide (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Basalt

Basalt (Aphanitic-fine grained mafic igneous rock)

Quartz Vein in Host Rock

Quartz (SiO2) in Mafic or Sedimentary Matrix

Iron Slag

Anthropogenic Iron Silicate