Sedimentary Rock (Possibly Conglomerate Or Breccia With A Quartz Vein)

Quartz Vein in Host Rock

Silicon dioxide (SiO2) veining in silicate matrix

Weathered quartz-rich pebble, possibly milky quartz or chalcedony

Quartz, SiO₂; exact variety uncertain from the image

Grey River Pebble (Greywacke / Basalt)

Stream-rounded silicate rock pebble

Jasper Breccia

Silicon Dioxide (SiO2) - Brecciated Microcrystalline Quartz

Conglomerate

Clastic sedimentary conglomerate

Likely quartz-bearing rock fragment

Quartz (SiO₂), possibly with iron-oxide staining or other mineral inclusions

Polished brecciated agate/jasper

Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide and possibly jasper inclusions

Quartz-rich rock fragment, possibly milky quartz or quartzite

Quartz (SiO₂), likely with minor iron-oxide or feldspar staining

Waterworn Pebble / Quartzite

Metamorphic/Sedimentary rock fragment

Quartz-bearing rock fragment

Likely quartz (SiO₂) with iron-oxide staining and possible host-rock grains

Iron-oxide-stained rock with a pale mineral vein

Likely limonite/goethite-stained quartz-bearing rock; exact identification is uncertain from the image

Quartz (with inclusions / Sandstone fragment)

Silicon Dioxide (SiO2)

Quartz Pebble / River Silt Grain

Silicon Dioxide (SiO2)

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)

Quartz crystal

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Conglomerate

Conglomerate (Rock composed predominantly of rounded clasts > 2mm)

Weathered quartz-rich rock, possibly chert or quartzite

Quartz (SiO₂), likely in a quartzite/chert matrix

Honey calcite (calcite-rich limestone/marble fragment)

Calcite — CaCO₃; likely coarse crystalline calcitic rock

Jasper and Quartz Breccia

Silicified Breccia / Microcrystalline Quartz with Iron Oxide

Common Gravel / Pebble

Lithified rock fragment / Detrital sediment

Polished orbicular/porphyritic granite or breccia

Likely potassium-feldspar–quartz granite with amphibole/biotite and epidote; exact variety uncertain from the image

Likely weathered quartz-bearing rock

Uncertain; possibly quartz-rich feldspathic material, with iron-oxide staining

Weathered conglomeratic sandstone

Polymictic conglomerate or pebbly sandstone, likely iron-stained

Polished dendritic agate or jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron/manganese oxide and possibly calcite veins

Weathered jasper-rich breccia

Silicified iron-rich breccia; primarily microcrystalline quartz (SiO₂) with iron oxides/hydroxides

Quartz vein in weathered host rock

Quartz (SiO₂), likely in a weathered metamorphic or igneous matrix

Brecciated Jasper

Sedimentary Chalcedony (SiO2)

Mixed polished rock/mineral specimens

Indeterminate from image; likely quartz-bearing material with iron-oxide staining and possibly mica-rich schist

Yellow quartz-bearing rock, possibly sulfur-stained quartz or calcite

Indeterminate; likely quartz (SiO₂) and/or calcite (CaCO₃) with yellow iron/sulfur staining

Conglomerate

Conglomeratic Sandstone

Milky quartz (possibly quartz-rich vein rock)

Quartz, silicon dioxide (SiO₂)

Quartz pebble (Quartzite / Chert)

Silicon Dioxide (SiO2)

Chert in Limestone (or Flint Nodule)

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Quartz-rich rock, likely weathered quartzite

Quartzite (predominantly crystalline SiO₂), possibly iron-stained quartz vein material

Quartz-rich rock fragment, possibly milky quartz

Quartz (SiO₂), likely a small vein-quartz or quartz-bearing rock fragment

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Jasper Agate (specifically Brecciated Jasper)

Silicon Dioxide (SiO2) with iron oxide and clay impurities

Basalt with Quartz/Calcite Vein

Amygdaloidal Basalt (matrix) with Mineral Vein filling

Quartz-rich pegmatite

Granitic pegmatite, chiefly quartz (SiO₂) with feldspar and possible mica

Milky quartz-rich rock

Quartz, silicon dioxide (SiO₂), likely massive milky quartz with iron-oxide or feldspar impurities

Quartz-veined Sandstone

Quartzite-veined Arenite / SiO2 and quartz sand

Conglomerate

Clastic Sedimentary (Conglomerate)