Rock (Likely Sedimentary)

Granite Pebble

Granite

Sandstone with trace fossil

Sandstone, possibly with Skolithos or similar trace fossil

River Rocks (Polished River Pebbles)

Stream-rounded clastic sediments

Shale

Laminated Mudstone (Shale)

Chert (specifically Yellow Jasper)

Sedimentary Cryptocrystalline Quartz (SiO2)

Weathered gray stone, possibly limestone or concrete-like carbonate rock

Tentatively micritic limestone (calcium carbonate, CaCO₃); exact identification is uncertain from the image

Possible fossilized ammonite or concretion

Indeterminate fossil specimen; possibly an ammonoid mold/cast in iron-rich sedimentary rock

Apatite

Fluorapatite (Ca5(PO4)3F)

Weathered banded metamorphic rock, likely gneiss

Banded gneiss; commonly quartz–feldspar–mica assemblage

Banded limestone or marble

Calcite-dominated carbonate rock; likely banded marble (CaCO₃)

Gabbro or Diorite with Quartz/Epidote Vein

Intrusive Igneous Rock (Plutonic)

Uncertain small pale mineral fragment

Indeterminate; possibly calcite or a light-colored feldspar fragment

Likely dark green-gray metamorphic pebble

Indeterminate; possibly chlorite schist, serpentinite, or amphibolite

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Ferruginous Sandstone

Sandstone, Iron-rich

Rounded weathered pebble, likely sandstone or altered limestone

Indeterminate clastic carbonate/siliciclastic rock; exact identification requires a fresh surface and tests

Sandstone (likely Navajo Sandstone)

Arenite (primarily SiO2)

Tumbled jasper, likely red/brown jasper

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides

Quartz-rich metamorphic rock (likely mica schist or gneiss)

Quartz–feldspar–mica assemblage; probable biotite schist/gneiss

Mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly with quartz and feldspar

Quartz (Milky or Smoky Quartz)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pale blue-gray quartz-rich pebble (tentative)

Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment

Weathered sandstone or arkose fragment

Quartz-rich clastic sedimentary rock; likely sandstone/arkose (dominantly SiO₂ quartz with feldspar and lithic grains)

Gneiss

Gneiss (High-grade metamorphic rock)

Iron-rich weathered rock (probable laterite or ironstone)

Goethite–hematite-bearing ironstone; approximately FeO(OH) and Fe₂O₃

Dark gray slate (possibly argillite or shale)

Slate, a low-grade metamorphic rock derived mainly from shale; composition commonly quartz, illite/muscovite, chlorite, and clay minerals

Vesicular Basalt / Scoria pebble

Extrusive igneous rock with amygdaloidal infilling

Shale or Argillite

Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)

Porphyritic Basalt

Basalt with Feldspar phenocrysts

Red jasper (likely iron-rich chert)

Microcrystalline quartz (SiO₂), colored by hematite/goethite; possibly brecciated jasper

Banded Chert or Chert with Quartz Veins

Chert (SiO2)

Granite

Granite; primarily quartz (SiO₂), feldspar, and mica

Milky quartz

Quartz (SiO₂), commonly massive or vein quartz

Chalcopyrite in Gossan

Chalcopyrite (CuFeS2) in a Limonite-rich Gossan matrix

Serpentinite

Serpentinite (Mg ₃ Si ₂ O ₅ (OH) ₄)

Drill Core Samples (Varied Lithology)

Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)

Quartz (on matrix)

Quartz (Silicon Dioxide, SiO₂)

Basalt Porphyry

Porphyritic Basalt

Yellow calcite crystal cluster with calcite fragment

Calcite, calcium carbonate (CaCO₃)

Tumbled brown translucent stone, likely quartz/jasper

Microcrystalline quartz (SiO₂), possibly iron-stained chalcedony or jasper

Small gray rock fragment, likely granite or diorite

Uncertain; probable coarse-grained silicate rock dominated by feldspar and quartz, possibly biotite/hornblende