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

Quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite if metamorphically recrystallized

Sandstone or Weathered Conglomerate

Sedimentary Rock (Quartzose Sandstone / Lithic Arenite)

Mica-bearing quartz or feldspar fragment

Likely milky quartz (SiO₂), possibly with biotite/muscovite inclusions; feldspar cannot be excluded visually

Pyrite-bearing quartz or sulfide-rich rock

Pyrite (FeS₂) in quartz-rich matrix, possibly with chalcopyrite

Polished brown mineral fragment, likely quartz-rich iron-stained material

Possibly quartz (SiO₂) with iron-oxide inclusions; exact identification is uncertain from the image

Rounded gray limestone pebble with a calcite vein

Calcitic limestone, composed predominantly of calcite (CaCO₃), locally cut by a white calcite vein

Quartz-rich vein rock, likely milky quartz with iron staining

Quartz (SiO₂), possibly quartz vein material with minor iron oxides and feldspar

Geode with Quartz and possibly Jasper/Hematite

Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides

Copper-bearing altered rock, likely chrysocolla-bearing quartzite or breccia

Quartz (SiO₂) with copper silicate minerals, chiefly chrysocolla [approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O], and iron oxides

Tumbled jasper, likely brecciated or orbicular jasper

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

Orbicular jasper

Silicified volcanic or sedimentary rock, primarily microcrystalline quartz (SiO₂) with iron-oxide-rich orbicules

Small white crystalline mineral fragment

Indeterminate; possibly calcite or quartz

Quartz Pebble

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine / Milky Quartz)

Silicon Dioxide (SiO2)

Weathered quartz-rich pebble

Likely quartz (SiO₂), possibly a small quartzite or feldspathic rock fragment

Yellow serpentine (likely lemon chrysoprase/serpentine breccia)

Serpentine-group minerals, chiefly antigorite/lizardite; commonly mixed with magnesite and iron oxides

Milky quartz (likely tumbled quartz fragment)

Quartz, silicon dioxide (SiO₂)

Iron-rich breccia or weathered ironstone

Goethite–hematite-bearing limonite, possibly brecciated host rock

Quartz in Matrix (possibly with Biotite or Hornblende)

Quartz (Silicon Dioxide, SiO2) in Granitic Matrix

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)

Blue-gray quartz-rich rock, possibly quartzite or massive quartz

Quartz (SiO₂), likely recrystallized as quartzite

Small quartz-rich rock fragment (possibly weathered quartz vein material)

Quartz (SiO₂) in an undetermined host rock; the image is insufficient to identify the host confidently

Quartz pebble

Silicon dioxide (SiO2)

Likely weathered quartz-rich rock or mineral fragment

Indeterminate from image; possibly quartz-bearing pegmatite or iron-stained quartz

Quartz-bearing metamorphic rock, likely quartzite

Quartzite; predominantly quartz (SiO₂), with possible feldspar, mica, and iron-oxide staining

Conglomerate

Clastic Sedimentary Conglomerate (SiO2 based clasts in matrix)

Quartz Vein in Host Rock (likely Sandstone or Mudstone)

Silicon Dioxide (SiO2) within Sedimentary Matrix

Tumbled quartz-rich rock, possibly jasperized quartz or quartzite

Quartz (SiO₂), likely with iron-oxide staining and minor feldspar or other silicate minerals; exact identification is uncertain from the photograph

Weathered, iron-stained rock (likely sandstone or breccia)

Indeterminate clastic sedimentary rock; possible ferruginous sandstone or weathered breccia

Weathered granitic rock, possibly pegmatitic granite

Granite; chiefly quartz, feldspar, and mica (SiO₂-rich crystalline rock)

Brecciated jasper (likely silicified breccia)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide matrix and lithic fragments

Weathered iron-rich rock, possibly limonite-bearing sandstone

Limonite/goethite-bearing sandstone or ferruginous conglomeratic rock

Quartz–pyrite-bearing vein rock, possibly gold-bearing

Quartz (SiO₂) with iron sulfides, chiefly pyrite (FeS₂), in altered host rock

River Pebble (Granite/Sandstone Pebble)

Rounded Quartz/Feldspar Gravel Clast

Likely weathered sandstone or iron-rich conglomeratic fragment

Quartz-rich sandstone, possibly ferruginous sandstone (SiO₂-dominated)

Clear quartz chips

Quartz (silicon dioxide, SiO₂)

Conglomerate

Conglomerate (SiO2 dominant in clasts)

Weathered quartz-rich pebble

Milky quartz, SiO₂, possibly quartzite or a quartz-rich granite fragment

Gold-bearing quartz or iron-stained quartzite

Quartz (SiO₂), possibly with native gold and iron oxides

Quartz-veined metamorphic rock, likely mica schist

Mica schist with a milky-quartz vein; predominantly quartz, feldspar, and biotite/muscovite mica

Brecciated Jasper / Fossiliferous Jasper Egg

Cryptocrystalline Quartz (SiO2) with iron oxides and mineral inclusions

Milky quartz with possible feldspar

Quartz (SiO₂), possibly intergrown with feldspar