Igneous, Metamorphic, And Sedimentary (Mixed Assemblage)

Quartz-rich metamorphic rock (likely quartzite)

Quartzite, composed mainly of quartz (SiO₂); exact identification is uncertain from the photo

Unakite

Epidotized Granite

Mixed rounded river pebbles, probably quartz-rich metamorphic and volcanic rocks

Predominantly quartzite/metachert, with possible rhyolite, sandstone, and iron-stained quartz; exact species cannot be determined confidently from the image

Granite fragment

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

Jasper and Quartz

Silicon Dioxide (SiO2)

Garnet (likely Almandine, Pyrope, or a blend)

Garnet group minerals: X3Y2(SiO4)3, where X and Y represent various metal ions (e.g., Almandine: Fe3Al2(SiO4)3, Pyrope: Mg3Al2(SiO4)3)

Green Aventurine

Silicon Dioxide with Fuchsite inclusions (SiO2)

Jasper (Green Jasper/Heliotropic Chert)

Silicon Dioxide (SiO₂)

Milky quartz

Quartz, silicon dioxide (SiO₂)

Ironstone concretion (possibly pyrite-bearing)

Iron-rich sedimentary concretion, likely composed of goethite/limonite with possible pyrite

Rounded river gravel (mixed alluvial pebbles)

Polymictic alluvial gravel; commonly composed of quartzite, granite, basalt, sandstone, and quartz

Blue-gray metamorphic rock fragment

Likely slate or phyllite; exact identification is uncertain from the photograph

Mixed rock specimens; likely pink feldspar/quartz and a dark, mica-bearing rock

Tentative visual identification: pink K-feldspar–quartz-rich granite/pegmatite fragments and a dark amphibole- or biotite-rich metamorphic rock; exact identification is uncertain from the image

Polished stone-bead bracelet, likely mixed natural stones

Unidentified assemblage; beads appear to include feldspar-rich stones and possibly granite or other silicate rocks

Pink Granite

Phaneritic intrusive igneous rock (Granite)

Pink Granite

Phaneritic intrusive igneous rock (Granite)

Concrete-like aggregate surface with embedded rock fragments

Anthropogenic concrete or exposed aggregate; not a natural rock specimen

Polymictic conglomerate or breccia (possibly concrete-like aggregate)

Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates

Iron-rich concretion or weathered ironstone

Goethite–hematite-rich limonite (FeO(OH)·nH₂O / Fe₂O₃)

Mixed Crushed Stone

Aggregate (varied mineral composition)

Weathered granitic gneiss (probable)

Gneiss, chiefly quartz–feldspar–biotite; compositionally granitic

Green Spot Jasper (Kiwi Jasper / Sesame Jasper)

Partially altered granitic rock rich in quartz, microcline feldspar, and tourmaline or amphibole inclusions

Copper Ore

Cupriferous Rock / Mixed Mineral Matrix

Magnetite

Magnetite (Fe3O4)

Blue Apatite

Calcium Phosphate Fluoride/Chloride/Hydroxide, Ca5(PO4)3(F,Cl,OH)

Apatite

Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)

Metallic sulfide mineral specimen, likely pyrite-bearing ore

Likely pyrite (FeS₂), possibly mixed with other sulfides or host rock

Mookaite Jasper

Silicified Radiolarite (SiO2 with iron impurities)

Coarse-grained granite

Granite, composed chiefly of quartz, potassium feldspar, plagioclase, and biotite/hornblende

Gravel (mixed crushed stone)

Unidentified aggregate of crushed natural rock fragments

Quartz

Silicon Dioxide (SiO2)

Blue Apatite

Ca5(PO4)3(F,Cl,OH)

Mixed stream-worn rocks, likely including quartz-rich gravel

Composition indeterminate; visible material may include quartz (SiO₂) and assorted lithic fragments

Pink Granite (Gneissic Granite)

Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)

Granodiorite

Granodiorite (containing Plagioclase, Quartz, K-Feldspar, and Hornblende or Biotite)

Pink Granite

Granite (rich in Potassium Feldspar/Orthoclase)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Blue Apatite

Ca5(PO4)3(F,Cl,OH)

Sandstone (lithic wake/graywacke variety)

Arenite/Greywacke (SiO2 with lithic fragments)

Weathered quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂), likely in a quartzite or silicified matrix