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

Orbicular jasper / brecciated jasper

Silica-rich microcrystalline quartz (chalcedony), commonly with iron oxides and altered volcanic fragments

Quartz-rich metamorphic rock, possibly quartzite

Quartzite; primarily crystalline silicon dioxide (SiO₂), with minor feldspar, mica, or iron oxides

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Wishing Stone (Basalt with Quartz Vein)

Basalt containing a microcrystalline quartz (SiO2) or calcite vein

Weathered quartz-rich rock, likely silicified limestone or quartzite

Microcrystalline quartz (SiO₂), possibly with calcite (CaCO₃) and iron-oxide staining

Quartz-rich vein rock, likely milky quartz in weathered host rock

Milky quartz (SiO₂), probably with weathered feldspar and iron-oxide staining

Quartz-rich Diorite

Diorite (Phaneritic intermediate igneous rock)

Weathered iron-stained quartzite or sandstone cobble

Quartzite (quartz-rich rock), possibly ferruginous sandstone

Fossilized Shell in Limestone

Carbonate sedimentary rock with Bivalvia or Brachiopoda remains

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Ferruginous Conglomerate

Conglomerate with Iron-Oxide Matrix (SiO2 + Fe2O3/FeO(OH))

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Matrix

Likely galena-bearing ore

Galena (lead sulfide, PbS), possibly mixed with sulfide minerals

Quartz Vein on Matrix

Silicon Dioxide (SiO2)

Wishing Stone (Basalt or Chert with Quartz Veins)

Basalt or microcrystalline Quartz (Chert) with localized hydrothermal Quartz (SiO2) veining

Milky Quartz with Country Rock contact

Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock

Milky quartz

Quartz (silicon dioxide, SiO₂)

Quartz (likely a weathered/tumbled piece)

Quartz (SiO₂)

Weathered quartz-rich stone, possibly fossiliferous limestone

Indeterminate; likely calcite-rich limestone (CaCO₃) or weathered quartz-bearing rock

Likely pink feldspar-rich granite or pegmatite

Granite/pegmatite; primarily quartz (SiO₂), alkali feldspar (KAlSi₃O₈), and plagioclase feldspar

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite and Quartz inclusions

Milky Quartz with inclusions

Silicon Dioxide (SiO2)

Weathered quartz-rich rock, possibly pegmatite or quartzite

Quartz (SiO₂)-rich aggregate; exact identification is uncertain from the photograph

Red Jasper (possibly with Agate inclusions)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered quartz-rich sandstone or granitic rock

Indeterminate; likely iron-stained quartz sandstone, possibly weathered granite

Gravel or Pebble

Clastic Sedimentary Grain (typically composed of Quartz or Silicate minerals)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz with inclusions (likely Chlorite or Hornblende) and country rock

SiO2 (Quartz) with associated ferromagnesian minerals

Asphalt / Road Aggregate

Bituminous Conglomerate (synthetic)

Weathered quartz-rich rock, possibly chert or quartzite fragment

Indeterminate; likely microcrystalline quartz (SiO₂), possibly with iron-oxide staining

Chert (and Chert Breccia)

Silicon Dioxide (SiO2)

Chert (Chert breccia)

SiO2 (Silicon Dioxide)

Mixed rock and mineral collection

Mixed lithologies; likely quartz, feldspar, basalt, granite, chert, sandstone, and metamorphic rocks

Quartz Vein Rock

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock (often Granite or Schist)

Silicon Dioxide (SiO2) within host matrix

Milky quartz-rich vein rock

Quartz, SiO₂, likely massive or microcrystalline quartz

Quartz Vein / Quartz Matrix

Silicon Dioxide (SiO2)

Likely weathered quartz-rich stone or fossil fragment

Indeterminate; possibly quartz-bearing sandstone, iron-stained quartz, or a fragmentary fossil

Milky quartz with iron-stained matrix

Quartz (silicon dioxide, SiO₂)