Mineral, Possibly Rock Fragment Containing A Mineral

Schist

Mica Schist

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (primarily SiO2)

K-Feldspar Granite Fragment

Granite (Alkali Feldspar-rich)

Lazulite

Lazulite (Mg,Fe2+)Al2(PO4)2(OH)2

Fossilized Echinoid Fragment (Calycinal/Boss Fossil)

Echinodermata fossil fragment

Gravel and Pebbles

Unconsolidated rock fragments / detrital sediment

Agatized fossil fragment, possibly silicified coral

Chalcedony (microcrystalline SiO₂) replacing carbonate fossil material

Basalt with Quartz Vein

Mafic volcanic rock with hydrothermal SiO2 filling

Granite featuring Quartz Vein

Granite with hydrothermal silica (SiO2) intrusion

Shale

Lutaceous Sedimentary Rock

Basalt

Extrusive mafic igneous rock

Weathered iron-rich rock, possibly limonite-bearing sandstone

Limonite/goethite mixture, approximately hydrated iron oxides (FeO(OH)·nH₂O), possibly coating sandstone or ironstone

Granite (likely weathered quartz-bearing granite)

Granite; primarily quartz, feldspar, and mica/amphibole

Picture Jasper

SiO2, Microcrystalline Quartz

Weathered iron-rich rock, possibly limonite/goethite

Limonite (hydrated iron oxides; commonly goethite, FeO(OH), mixed with hematite)

Limestone and Quartz Gravel with Petrified Wood

Sedimentary gravel aggregate and fossilized wood

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)

Weathered basalt or other dark volcanic rock

Likely basalt; predominantly plagioclase feldspar and pyroxene, possibly olivine and iron oxides

Quartz (with probable host rock)

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt (containing quartz/agate or zeolite fill)

Fossiliferous Sandstone

Sedimentary rock containing invertebrate fossils

Weathered copper-bearing rock, possibly malachite/chrysocolla-bearing matrix

Indeterminate; likely copper carbonate/silicate minerals in a host rock, potentially malachite (Cu₂CO₃(OH)₂) or chrysocolla (hydrated copper silicate)

Weathered granite or granitic gneiss slab

Granitic rock, chiefly quartz, feldspar, and mica; exact identification is uncertain from the photograph

Weathered iron-rich rock, possibly limonite-bearing basalt or ironstone

Undetermined; likely iron oxides/hydroxides (goethite–hematite–limonite) in a silicate host

Shale

Argillaceous Sedimentary Rock

Sandstone (with cross-bedding)

Arenite (composed primarily of Quartz: SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Botryoidal chalcedony (possibly agate/geode material)

Microcrystalline quartz, SiO₂; commonly chalcedony with quartz-lined cavities and iron-oxide staining

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Breccia

Clastic Breccia

Chalcedony (Blue Dragon/Gray Chalcedony)

Silicon Dioxide (SiO₂)

Conglomerate

Clastic Sedimentary Rock

Dalmatian Stone

Peralkaline Feldsphathic Igneous Rock

Quartz Geode

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Red Sandstone

Clastic Sedimentary Rock (typically contains Quartz and Iron Oxide)

Pebble (likely Sandstone or Granitic Pebble)

Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)

Likely weathered fossil bone fragment

Indeterminate fossilized bone; taxonomic identification requires microscopy and locality data

Tumbled jasper or rhyolitic porphyry

Silicic volcanic rock, likely rhyolite (quartz- and feldspar-rich), possibly jasperized

Conglomerate

Conglomerate (clastic sedimentary rock)

N/A - Non-Geological Item