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

Brecciated Jasper

Silicon dioxide (SiO2) microcrystalline quartz breccia

Quartz Vein in Sandstone

Hydrothermal Quartz (SiO2) in Arenite

Polished brecciated jasper

Silicified microcrystalline quartz (SiO₂), commonly called brecciated or ocean jasper

Quartz pebble

Silicon dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂); possibly quartzite, a metamorphosed quartz sandstone

Conglomerate

Conglomerate (SiO2 matrix with varying clasts)

Gneiss with Quartz Vein

Gneiss containing Quartz (SiO2) filler

Tumbled quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly weathered chert or chalcedony

Quartz-veined altered rock

Likely quartz-bearing metasediment or altered igneous rock; vein mineral: quartz (SiO₂)

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Tumbled cream-colored stone, possibly quartz or calcite

Indeterminate from photograph; likely microcrystalline quartz (SiO₂) or calcite (CaCO₃)

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly iron-stained or mixed with feldspar

Iron-stained quartz-rich rock, likely brecciated quartz vein

Quartz (SiO₂) with iron oxides/hydroxides, chiefly hematite and goethite; possibly limonite

Iron-oxide-stained quartz-rich rock (possibly quartz vein material)

Likely quartz (SiO₂) with iron-oxide/hydroxide staining; exact rock type cannot be determined from the image alone

Quartz vein fragment

Quartz, silicon dioxide (SiO₂), likely milky to translucent quartz with iron-oxide or clay inclusions

Tumbled quartz pebble (likely milky quartz or chalcedony)

Quartz, SiO₂; possibly microcrystalline quartz (chalcedony)

Exposed Aggregate Concrete (Pea Gravel)

Concrete with Siliceous Alluvial Gravels

Tumbled jasper, likely brecciated or brown-green jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral impurities

Iron-stained quartz-rich rock

Milky quartz with limonite/goethite staining; possibly quartzite or silicified rock

River Gravel

Polymictic Gravel / Detrital Rock Aggregate

Jasper Conglomerate (Puddingstone)

Jasper Conglomerate (Siliceous Sedimentary Rock)

Quartz Pebble

Silicon Dioxide (SiO2)

Polished/tumbled pale-yellow stone, possibly calcite

Likely calcite (CaCO₃); identification is uncertain from the image alone

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered quartz-rich pebble

Quartzite or silicified sandstone; predominantly microcrystalline quartz (SiO₂)

Likely milky quartz, possibly quartz-rich vein rock

Quartz (SiO₂); identification from the image is uncertain

Weathered iron-rich rock, possibly hematite-bearing breccia

Hematite (Fe₂O₃)-rich lithic fragment; exact host rock is uncertain from the image

Likely polished gray quartzite or chert

Quartzite, predominantly microcrystalline SiO₂; possibly gray chert (chalcedony/quartz)

Red Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Red Breccia Jasper

Silicon Dioxide (SiO2) with hematite and various mineral inclusions

Quartz-rich rock fragment, possibly milky quartz or quartzite

Quartz (SiO₂), or quartzite if the grains are fused

Likely iron-stained quartz or ironstone with a glittering mica-like surface

Uncertain from the photo; possibly quartz (SiO₂) with iron-oxide staining and mica or sulfide grains

Possible weathered quartz-rich pebble

Likely microcrystalline quartz (SiO₂), possibly quartzite or chalcedony

Quartz-rich breccia or silicified rock with metallic sulfide mineralization

Microcrystalline and crystalline SiO₂, likely quartz/chalcedony, with possible pyrite or other sulfides

Likely limonite/goethite-rich ironstone

Limonite (amorphous hydrated iron oxides), commonly mixed with goethite, hematite, and host rock

Quartz Vein in Host Rock

Crystalline Silicon Dioxide (SiO2) in Pelitic or Shaly Matrix

Milky quartz-bearing rock, likely quartzite or silicified limestone

Quartz (SiO₂), possibly in a quartzite or chalcedony-rich matrix

Milky quartz vein rock

Quartz-rich hydrothermal vein; primarily quartz (SiO₂), with minor iron oxides and possibly feldspar or mica

Quartz-veined Limestone

Sedimentary limestone with quartz/calcite veinlets

Gravel and Pebbles

Unconsolidated rock fragments / detrital sediment

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with feldspar and mica impurities