Mineral, Specifically A Rock Fragment

Unidentified gray rock fragment

Indeterminate from image; possibly quartz- or feldspar-rich silicate material

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Agate Geode

Banded Chalcedony (Silicon Dioxide, SiO2) with Quartz crystals

Likely banded gneiss

Quartz–feldspar–mica gneiss (tentative visual identification)

Sandstone

Arenite (specifically sublithic or quartz arenite)

Likely milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz Crystal

Silicon Dioxide (SiO2)

Obsidian

Obsidian (volcanic glass)

Amygdaloidal Basalt with Epidote/Chlorite

Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))

Weathered quartz-rich rock, likely granite or quartzite

Indeterminate; probable quartz–feldspar aggregate, possibly granitic gneiss

Unidentified rough rock fragment

Indeterminate; no diagnostic mineral or texture can be confirmed from the image

Epidosite with Quartz (Unakite-variant or Jasper)

Epidotized Metasomatite

Fossilized Angel Wing Shell

Cyrtopleura costata

Small weathered mineral/rock fragment

Uncertain from image; possibly quartz-rich sandstone or a feldspar-bearing rock

Dalmation Jasper (or Dalmation Stone)

Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)

Weathered vesicular basalt (likely amygdaloidal basalt)

Basalt, composed mainly of plagioclase feldspar, pyroxene, and altered olivine; cavities may contain secondary zeolite, calcite, or silica

Pink Granite

Granite (Phaneritic Igneous Rock)

Hag Stone

Perforated Sedimentary Rock (typically Limestone or Sandstone)

Gravel or Crushed Stone

Fragmented Aggregate Stone

Pink Granite

Phaneritic Felsic Igneous Rock

Likely quartz-bearing rock fragment

Quartz (SiO₂), possibly with iron-oxide staining or other mineral inclusions

Dalmatian Stone

Dalmatian Jasper (Aplite rock composition)

Small brown-gray mineral fragment

Indeterminate; possibly weathered quartz-, feldspar-, or iron-oxide-bearing rock

Chert (Flint Arrowhead)

Microcrystalline Quartz (SiO2)

Possibly garnet-bearing rock fragment

Unidentified reddish-brown mineral or rock; the image is insufficient for a reliable species identification.

Small dark mineral or rock fragment

Undetermined; possibly a dark mafic mineral such as biotite or magnetite

Likely muscovite mica schist

Muscovite-rich mica schist; muscovite KAl₂(AlSi₃O₁₀)(OH)₂

Imperial Topaz

Al2SiO4(F,OH)2 (Fluorine-bearing Aluminum Silicate)

Amethyst

SiO2 (Silicon Dioxide with iron impurities)

Quartz-bearing rock fragment

Likely milky quartz with iron-oxide staining and possible host-rock minerals; exact identification is uncertain from the image.

Quartz (Milky or Cloudy)

Silicon Dioxide (SiO2)

Small weathered rock fragment

Indeterminate; possibly granitic or altered feldspathic material

Jasper (specifically Red or Brecciated Jasper variant)

Jasper (Microcrystalline Quartz - SiO2)

Generic Pebble / Rock Fragment

Lithic fragment / Weathered rock

Quartz Crystal (specifically a Double-Terminated variety)

Silicon Dioxide (SiO2) - Low Quartz

Vesicular Basalt (or Scoria)

Extrusive Igneous Rock (Mafic)

Dalmatian Jasper

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz-rich rock fragment

Likely milky quartz or quartz-rich vein material (SiO₂); exact identification is uncertain from the image

Rough Black Diamond (Bort / Carbonado)

Diamond (C)

Pink Granite

Granite (Alkali-feldspar granite)