Synthetic (Not A Rock Or Mineral)

Weathered granite (likely)

Granite, a quartz–feldspar–mica intrusive igneous rock

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Likely weathered iron-rich breccia or jasper

Silicified iron-oxide breccia; exact identification requires testing

Agate (specifically a Yellow/Honey Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2) with various iron-oxide inclusions

Vesicular Basalt (Scoria)

Basalt with vesicular texture

Dark-colored Igneous Rock (likely Basalt or Diabase)

Basalt (extrusive igneous) or Diabase (intrusive igneous)

Shale with Quartz Veins

Fissile Sedimentary Rock (SiO2)

Porphyritic Basalt or Porphyritic Andesite

Porphyritic Extrusive Igneous Rock

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Milky Quartz Pebble with Iron Inclusions

Silicon Dioxide (SiO2)

Sandstone with Concretions / Liesegang Rings

Arenite with iron oxide banding

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Sandstone

Arenite

Banded Sandstone

Arenite (with iron oxide banding)

Quartz (Milky/Crystalline)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (Siliclastic Sedimentary Rock)

River Cobble (Weathered Granitoid)

Granodiorite / Quartz Diorite

Glacial Cobble with Granite Inclusion

Porphyritic Basalt or Andesite containing Granitic Xenolith

Small rounded mineral/rock fragment

Indeterminate; possibly quartz-rich stone or feldspar

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Moonstone

Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8

Chert with Quartz Veining

Microcrystalline Silica (SiO2)

Coarse-grained granite or granitic pegmatite fragment

Granite; primarily quartz, feldspar, and mica

Painted Rock / Geode Specimen

Silicon Dioxide with artificial pigment coating

Blue cabochon gemstone, likely synthetic spinel or glass

Undetermined; possible synthetic cobalt-blue spinel (MgAl₂O₄) or colored glass

Veined Pebble (Quartz/Calcite Veined Metamorphic/Sedimentary Rock)

Quartz / Calcite Veined Fault Breccia or Metamorphic Pebble

Shale

Laminated Mudstone (Shale)

Sandstone

Clastic Sedimentary Rock

Agated Chert

Microcrystalline Quartz (SiO2)

Biotite Mica Schist

Metamorphic Rock containing Biotite K(Mg,Fe)3AlSi3O10(OH)2

Moqui Marble

Hematite-Goethite Concretion

Green glassy mineral specimen, likely rough emerald or green fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Shale

Shale (clastic sedimentary rock)

Mixed rough mineral specimens, likely quartz-bearing rocks

Probable quartz (SiO₂), with possible feldspar, iron oxides, and altered host rock

Basalt

Basalt

Small weathered mineral/rock fragment

Unidentified; likely quartz-rich material, possibly quartzite or feldspar-bearing rock

Weathered granite or granitic gneiss pebble

Granite; primarily quartz, potassium feldspar, plagioclase, and mica

Banded Gneiss

Gneiss (Foliated Metamorphic Rock)

Greenstone (likely chlorite-rich metamorphic rock)

Chlorite-bearing greenschist; exact identification requires testing

Quartz Geode

Silicon Dioxide (SiO2) within a geode