Sedimentary Or Igneous (Host Environment)

Mica-rich metamorphic rock, likely biotite schist

Biotite–quartz schist; probable composition of quartz, biotite, feldspar, and minor sulfide or iron-oxide minerals

Small pale mineral/rock fragment

Indeterminate; possibly weathered quartz, calcite, or light-colored limestone

Quartz Crystal (specifically a small Clear Quartz point)

Silicon Dioxide (SiO2)

Quartz Veined Siltstone

Siltstone with Quartz (SiO2) intrusion

Quartz

Silicon Dioxide (SiO2)

Amethyst Quartz

SiO2 (Silicon Dioxide)

Milky Quartz

Silicon Dioxide (SiO2)

Weathered schist or gneiss fragment

Quartz–feldspar–mica metamorphic rock; likely mica schist or gneiss

Quartz-rich mineral fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Quartz

Silicon Dioxide (SiO2)

Banded gneiss pebble

Gneiss, likely quartz–feldspar–mica gneiss

Quartz (Milky Quartz/Citrine Type)

Silicon Dioxide (SiO2)

Small brown mineral fragment

Unidentified; the image lacks enough detail for a reliable species-level identification

Carnelian (Chalcedony)

SiO2 (Silicon Dioxide - Microcrystalline Quartz)

Quartz vein fragment

Quartz, silicon dioxide (SiO₂), likely milky to translucent quartz with iron-oxide or clay inclusions

Ferruginous Quartz

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Crystal Cluster

Quartz (Silicon Dioxide, SiO2)

Quartz on Host Rock

Silicon Dioxide (SiO2)

Raw Agate (Chalcedony Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz

Silicon Dioxide (SiO2)

Mica-rich rock, likely mica schist

Mica schist, composed chiefly of muscovite and/or biotite with quartz and feldspar

Mica schist (likely biotite–muscovite schist)

Mica schist; chiefly quartz and mica minerals (muscovite KAl₂(AlSi₃O₁₀)(OH)₂ and/or biotite)

Weathered foliated metamorphic rock, likely schist or gneiss

Micaceous schist/gneiss; composition likely quartz, feldspar, mica, and altered mafic minerals

Moss Agate

Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide

Small rounded pebble, likely quartz-rich sandstone or granitoid fragment

Uncertain; probable quartz/feldspar-bearing lithic pebble

Unopened Geode

Geode (containing various mineralization like Quartz SiO2)

Quartz-rich rock, likely milky quartz vein material

Mostly quartz (SiO₂); exact rock type cannot be determined from the image alone

Likely biotite-rich schist

Mica schist, likely containing biotite and quartz; exact identification requires examination

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Pyrite (on Quartz/Host Rock)

Iron Sulfide (FeS₂)

Quartz Geode

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz vein in weathered host rock

Quartz (SiO₂), likely in a weathered metamorphic or igneous matrix

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary or Igneous Matrix

Weathered quartz-bearing metamorphic rock, likely mica schist or gneiss

Quartz–feldspar–mica assemblage; exact mineral identification requires testing

Quartz

Silicon Dioxide (SiO2)

Weathered metamorphic rock, likely schist or gneiss

Quartz–feldspar–mica metamorphic rock; exact identification requires testing

Fossiliferous rock fragment (possible shell fossil)

Likely a calcium-carbonate fossil in limestone; exact fossil and host rock are not identifiable from the image

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)