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

Quartz-rich rock fragment

Microcrystalline quartz (SiO₂), possibly chalcedony or quartz-bearing breccia

Polygenetic Conglomerate (or Breccia)

Clastic Sedimentary Rock

Quartz-Veined Sandstone

Quartz-veined Arenite

Weathered iron-rich sandstone or conglomeratic sedimentary cobble

Ferruginous sandstone, possibly polymictic conglomerate

Conglomerate with Quartz Inclusions

Conglomerate (clastic sedimentary rock) with internal Quartz (SiO2)

Brecciated Jasper

Silicon Dioxide (SiO2) with iron impurities

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

Quartz / Calcite Veined Fault Breccia or Metamorphic Pebble

Vein-bearing sandstone or quartzite cobble

Quartz-rich sandstone with white quartz veins; possibly metamorphosed to quartzite

Conglomerate

Conglomerate (Sedimentary Rock)

Conglomerate

Conglomerate rock (detrital sedimentary)

Hydrothermal Quartz Breccia

Hydrothermal Breccia with Quartz and Chloritic/Epidote Clasts

Weathered quartz-rich rock, possibly chert or milky quartz

Mostly microcrystalline or crystalline quartz (SiO₂), identification uncertain from photograph

Shale with Vein Infillings

Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.

Quartz-rich breccia or quartzite with iron-oxide veining

Microcrystalline to granular SiO₂ (quartz), with hematite/goethite and minor feldspar or mica

Unidentified weathered rock, possibly quartz-bearing granite or rhyolite

Indeterminate; likely quartz–feldspar-rich silicate rock

Chalcedony Nodule in Matrix

Silicon Dioxide (SiO2)

Conglomerate (Quartz Pebble Conglomerate)

Quartz Pebble Conglomerate

Quartz-veined Sandstone

Sedimentary rock with quartz vein (SiO2)

Conglomerate

Conglomerate (Sedimentary Rock)

Conglomerate

Conglomerate Sedimentary Rock

Conglomerate

Conglomerate (clastic sedimentary rock)

Vesicular quartz-rich rock, possibly weathered rhyolite or hydrothermal quartz

Likely quartz (SiO₂) with altered feldspar, iron oxides, and cavities; exact identification requires testing

Jasper and Quartz Breccia

Silicified Breccia (Quartz / Chalcedony / Hematite)

Conglomerate

Conglomerate (Sedimentary Clastic Rock)

Weathered limestone or calcitic cave deposit

Calcite (CaCO₃), likely porous limestone/travertine

Conglomerate

Conglomerative Sedimentary Rock

Conglomerate

Clastic sedimentary rock (Conglomerate)

Weathered quartz-rich cobble, possibly milky quartz with iron staining

Quartz (SiO₂), likely with iron-oxide/hydroxide coatings and minor host-rock inclusions

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2)

Likely weathered iron-rich rock

Probable basalt or limonite/goethite-stained mafic rock; exact identification requires testing

Weathered quartz-rich stone, possibly chalcedony or calcite

Likely microcrystalline quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Conglomerate

Conglomerate (clastic sedimentary rock)

Pale blue-gray quartz-rich pebble (tentative)

Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment

Yellow jasper (likely ocean jasper or brecciated jasper)

Jasper, microcrystalline quartz (SiO₂) with iron-oxide staining and dark mineral veins

Conglomerate

Conglomerate (clastic sedimentary rock)

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

Pink-and-white quartz-rich rock, likely rose quartz matrix

Quartz (SiO₂), possibly intergrown with feldspar or chalcedony

Quartz crystal fragment in weathered host rock

Quartz (SiO₂), possibly in a feldspathic or iron-stained matrix

Chalcedony (possibly agate or common quartz)

Microcrystalline quartz, SiO₂

Polished brecciated jasper (likely septarian or iron-rich jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and possibly calcite or other rock fragments

Conglomerate (Pebble Conglomerate)

Conglomerate

Iron-stained quartz-rich rock, possibly quartzite or hydrothermal quartz

Quartz (SiO₂), likely with iron oxides; exact host rock uncertain from the photograph