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

Quartz pebble

Silicon dioxide (SiO2)

Banded Sedimentary Rock

Sedimentary Rock with Quartz/Feldspar Vein

Quartz-rich rock fragment, likely milky quartz

Quartz (silicon dioxide, SiO₂), possibly an iron-stained quartz vein fragment

Weathered quartz-rich rock, likely quartzite or quartz vein

Quartzite; predominantly quartz (SiO₂), possibly iron-oxide stained

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Small pale mineral fragment

Indeterminate; possibly quartz or calcite

Weathered quartz-rich cobble, likely quartzite

Quartzite (mostly microcrystalline SiO₂), possibly quartz-rich sandstone or vein quartz

Quartz Pebble with Host Rock / Schist Matrix

Silicon Dioxide (SiO2) with Metamorphic Host Rock

Tumbled quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly chalcedony or quartzite

Conglomerate

Clastic sedimentary rock (composed mostly of SiO2)

Sandstone with Quartz Vein

Arenite with Crystalline Silica (SiO2)

Quartz-rich geode or mineralized cavity in host rock

Likely a quartz-bearing geode; the pale crystals may be quartz (SiO₂), but the photo is not detailed enough for a firm identification.

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Weathered quartz-rich rock, possibly quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), identification uncertain from the photograph

Conglomerate

Conglomerate

Quartz vein specimen, likely milky quartz with iron-stained host rock

Quartz (SiO₂), possibly with chalcedony and sulfide/oxide-bearing matrix

Wishing Stone (Basalt/Greywacke with Quartz Vein)

Basalt or Siltstone with SiO2 (Quartz) hydrothermal intrusion

Conglomerate

Conglomeratic Sandstone

Quartz-veined river pebble

Quartz-bearing metamorphic rock, possibly silicified schist or altered volcanic rock

Puddingstone

Conglomerate (Indurated)

Basalt with Quartz/Calcite Vein

Aphanitic Mafic Volcanic Rock with Quartz (SiO2) or Calcite (CaCO3) Vein

Tumbled quartz-rich stone, possibly milky quartz or calcite

Quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Basalt with Quartz Vein

Basalt (extrusive igneous rock with SiO2 vein inclusion)

Pyrite-bearing quartz vein rock

Pyrite (FeS₂) in quartz, possibly with iron-oxide weathering products

Quartz Pebble

Silicon Dioxide (SiO2)

Red Breccia Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Weathered quartz-rich pebble, possibly milky quartz

Quartz (SiO₂), provisionally identified

Quartz-rich pale rock fragment

Likely milky quartz (SiO₂), possibly quartzite

Small quartz-rich mineral fragment

Quartz (SiO₂), possibly milky or chalcedonic quartz

Conglomerate

Conglomeratic Sandstone

Concrete rubble

Anthropogenic conglomerate

Weathered chert or siliceous iron-rich rock

Microcrystalline quartz (SiO₂), possibly ferruginous chert/jasper

Jasper-Quartz Conglomerate / Chert

Siliceous Sedimentary Rock (SiO2)

River Pebble (likely Quartzite or Chert)

Sedimentary Clast (Silicon Dioxide dominant)

Quartz-rich granitic rock, possibly pegmatite

Granite or granitic pegmatite; primarily quartz (SiO₂), feldspar, and minor mica/iron oxides

Weathered quartz-rich rock, possibly milky quartz or quartzite

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

Polished blue-gray mineral specimen, likely galena-bearing ore

Galena (PbS), possibly mixed with quartz/calcite and secondary copper minerals

Weathered quartz-rich rock, possibly quartzite

Quartzite (predominantly SiO₂), tentative identification

Puddingstone (Gowganda Tillite/Jasper Conglomerate)

Jasper Conglomerate (SiO2 primary composition)

Quartz-rich mineral fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Chert (with Quartz Vein)

Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)

Weathered quartz-rich pebble

Likely milky quartz or quartzite (SiO₂), possibly a weathered feldspathic rock