Minerals

Septarian Nodule (Sphere)

Septarian (composed of Calcite, Aragonite, and Limestone/Claystone)

Gossan (Iron Hat)

Gossan (secondary iron oxide cap)

Mica Schist

Mica Schist

Granite

Intrusive igneous rock

Gneiss

Metamorphic Gneiss (High-grade regional metamorphism)

Granite or Granodiorite (weathered fieldstone)

Granitoid

Diamond

Diamond (pure carbon, C)

Granite

Granite

Granite (Phaneritic Igneous Rock)

Granite

Granite

Phaneritic Plutonic Felsic Rock

Weathered brown rock fragment

Indeterminate; possibly weathered granite, gneiss, or iron-stained quartz-rich rock

Olivine (Peridot when gem-quality)

Olivine Group (Magnesium Iron Silicate, (Mg,Fe)2SiO4)

Granite

Phaneritic plutonic rock (SiO2 rich)

Erythrite in Cobaltite Ore

Erythrite (Co3(AsO4)2·8H2O) with Cobaltite (CoAsS)

Mica Schist

Schist

Tumbled green stone, possibly serpentine or prehnite

Provisional identification: serpentine-group mineral, commonly antigorite; alternatively prehnite or green calcite

Dark gray metamorphic rock fragment

Likely slate or fine-grained schist; mineral composition cannot be confirmed from the image

Unidentified Dark Mineral or Rock

Indeterminate (Likely Silicon Dioxide or Carbon-based)

Copper Ore (likely Malachite or Chrysocolla staining)

Copper Secondary Mineral (e.g., Cu2CO3(OH)2)

Limonite / Goethite pseudomorph

Hydrated Iron Oxide (FeO(OH)·nH2O)

Lepidolite Pebble

K(Li,Al)3(Al,Si,3O10)(F,OH)2

Likely quartz-rich rock fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz or a quartz-bearing stone

Limonite (Iron Ore)

Hydrated ferric oxide mixture (FeO(OH)·nH2O)

Quartz Pebble

Silicon Dioxide (SiO2)

Hematite

Hematite (Fe2O3)

Banded gneiss

Quartz–feldspar–mica gneiss

Granite Pebble

Granite (Phaneritic Quartz-Feldspar Rock)

Vesicular basalt (probable)

Basalt, mainly plagioclase feldspar and pyroxene, with possible olivine and iron oxides

Colorless quartz crystal (likely rough rock crystal)

Quartz, silicon dioxide (SiO₂)

Clear quartz pebble

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz cluster

Quartz (silicon dioxide, SiO₂), likely a massive-to-drusy specimen with possible mica inclusions

Tumbled quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly milky quartz or chalcedony

Magnetite / Iron-Rich Basalt

Magnetite bearing Mafic Rock (Fe3O4)

Tumbled white quartz (likely milky quartz)

Quartz — silicon dioxide (SiO₂)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Likely tumbled white quartz or quartzite pebble

Quartz (SiO₂), possibly quartzite

Feldspar

Feldspar (Orthoclase/Microcline)

Tumbled milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Quartz crystal fragment (likely milky/included quartz)

Quartz, silicon dioxide (SiO₂)

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Likely mica-rich schist

Biotite–quartz–feldspar schist (tentative)