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

Sandstone (Pebble/Conglomerate fragment)

Sandstone (clastic sedimentary rock)

Iron-rich breccia or weathered ironstone

Goethite–hematite-bearing limonite, possibly with quartz and altered rock fragments

Quartz-rich river pebble, possibly quartzite

Quartz (SiO₂); possibly quartzite, a rock composed predominantly of recrystallized quartz

Quartz Pebble

Silicon Dioxide (SiO2)

Polished orbicular jasper or rhyolitic jasper

Silica-rich microcrystalline quartz/chalcedony (SiO₂), likely jasper with contrasting mineral veins

Possible weathered metal-rich rock or slag fragment

Uncertain; possibly iron-oxide-rich breccia or industrial slag

Likely milky quartz fragment

Quartz (silicon dioxide, SiO₂), possibly with iron-oxide or mica inclusions

Quartz-rich pegmatitic rock with possible epidote or chlorite

Hydrothermal/pegmatitic quartz-bearing rock; identifiable minerals may include quartz (SiO₂), feldspar, and epidote/chlorite

Quartz Pebble

Silicon Dioxide (SiO2)

Fossiliferous iron-rich breccia/conglomerate

Clastic sedimentary rock containing lithic fragments and possible fossil or concretionary structures; iron oxides/hydroxides (hematite–goethite)

Puddingstone (Jasper Conglomerate)

Conglomerate (specific type: Jasper Conglomerate or Hertfordshire Puddingstone)

Rounded pebble, likely mixed lithology

Lithology uncertain; possibly a fine-grained metamorphic or volcanic rock with a quartz-rich/pink feldspar vein or inclusion

Weathered quartz-rich rock, possibly milky quartz in altered host rock

Milky quartz (SiO₂), with probable iron-oxide staining and a fine-grained host matrix

Vein-filled Sedimentary Rock

Silicified sedimentary rock with quartz/calcite vein

Metaconglomerate

Metaconglomerate (Quartzite conglomerate)

Quartz-veined Mudstone or Argillite

SiO2 (Quartz) in Siltstone/Mudstone matrix

Conglomerate

Polymictic Conglomerate

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Milky Quartz in Conglomerate Matrix

Silicon Dioxide (SiO2) within Clastic Sedimentary Rock

Quartz vein rock

Milky quartz with smoky quartz; chiefly silicon dioxide (SiO₂)

Concrete

Anthropogenic Conglomerate

Conglomerate

Conglomerate (SiO2 matrix with varying clasts)

Red Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Quartz-veined Siltstone/Greywacke

Clastic Sedimentary Rock with Quartz Infill (SiO2 vein)

Puddingstone (Polished Pebble)

Conglomerate (Quartz-rich)

Weathered quartz-rich rock, possibly chert or milky quartz

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

Likely quartz-bearing rock fragment

Quartz (SiO₂), possibly with calcite or feldspar

Polymict conglomerate

Clastic conglomerate, likely polymictic pebble conglomerate

Jasper and Quartz Breccia

Silicified breccia (SiO2)

Conglomerate

Conglomerate (SiO2 matrix with various lithic clasts)

Banded dark pebble (likely gneiss or banded metamorphic rock)

Indeterminate from the image; possibly banded gneiss

Quartz-rich pebble, possibly vein quartz

Quartz (SiO₂), possibly with iron-oxide staining and minor inclusions

Polished quartz-rich breccia

Quartz–feldspar breccia; predominantly SiO₂ with feldspar and iron-oxide minerals

Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)

Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein

Weathered quartz-rich rock, possibly quartzite or quartz vein fragment

Quartzite (mostly microcrystalline SiO₂), identification uncertain from image

Foliated metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss, possibly migmatitic gneiss

Quartz Vein in Host Rock

Quartz (SiO2) in Mafic or Sedimentary Matrix

Quartz-rich vein fragment, possibly quartz with mica or calcite

Quartz (SiO₂), with probable muscovite/biotite mica and minor feldspar or calcite

Puddingstone

Conglomerate (Jasper Conglomerate)

Conglomerate

Conglomerate

Quartz-rich rock, likely milky quartz with iron staining

Quartz (SiO₂), possibly a quartz vein fragment

Rounded quartz-rich pebble

Likely microcrystalline quartz (SiO₂), possibly milky quartz or a pale quartzite fragment