Shale or Slate with Quartz Veins
Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins
Metamorphic, likely Sedimentary with Quartz veins
Category
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Small rounded mineral/rock fragment
Indeterminate; possibly quartz-rich stone or feldspar
mineral
Chert with Quartz Veining
Microcrystalline Silica (SiO2)
sedimentary
Agated Chert
Microcrystalline Quartz (SiO2)
sedimentary
Biotite Mica Schist
Metamorphic Rock containing Biotite K(Mg,Fe)3AlSi3O10(OH)2
metamorphic
Granite
Granite
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Unknown Tumbled Stone
Unknown (Too Blurry)
mineral
Sedimentary Rock Fragments
Clastic Sedimentary Rock
sedimentary
Sandstone Cobble
Arenite (primarily SiO2)
sedimentary
Tiger's Eye
Silicon dioxide with crocidolite inclusions (SiO2)
mineral
Small stone fragments
Undetermined; the image does not show enough detail for a reliable identification
mineral
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Granite
Granite; primarily quartz, feldspar, and mica
igneous
Quartz Crystal on Matrix
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in a sedimentary or volcanic host
mineral
Banded metamorphic rock (likely gneiss or schist)
Foliated quartz–feldspar–mica rock; exact identification is uncertain from the photograph
metamorphic
Quartz Geode
Silicon Dioxide (SiO2) within a sedimentary or volcanic shell
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Coarse-grained granite or granitic pegmatite fragment
Granite; primarily quartz, feldspar, and mica
igneous
Greenstone (likely greenschist)
Chlorite–actinolite–epidote-rich metabasalt; mineral proportions cannot be confirmed from the photo
metamorphic
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Lapis Lazuli
(Na,Ca)8(AlSiO4)6(SO4,S,Cl)2 (Complex silicate rock)
rock
Weathered granite or granitic gneiss pebble
Granite; primarily quartz, potassium feldspar, plagioclase, and mica
igneous
Quartz in Matrix (possibly Basalt or Siltstone host)
Silicon Dioxide (SiO2) in Host Rock
mineral
Red jasper
Jasper, an opaque microcrystalline quartz variety (SiO₂), colored mainly by iron oxides
mineral
Black Obsidian
Volcanic Glass
igneous
Herkimer Diamond
Quartz (Silica - SiO2)
mineral
Banded Sandstone
Quartzose Arenite
sedimentary
Sandstone (with weathered rind / conglomerate grain)
Arenite
sedimentary
Sandstone (with weathering rind)
Arenite (primarily SiO2 with iron oxide cementing)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Sedimentary Concretion/Disk)
Arenite (predominantly SiO2)
sedimentary
Sandstone (or Weathered Limestone Pebble)
Arenite / Calcarenite
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
Glacial Cobble with Granite Inclusion
Porphyritic Basalt or Andesite containing Granitic Xenolith
igneous
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Quartz Vein in Amphibolite / Gneiss
Quartz (SiO2) in Mafic Metamorphic Host Rock
metamorphic
Small rough mineral fragment, possibly quartz or feldspar
Unidentified silicate mineral; image is insufficient for a reliable species identification
mineral