Sandstone (likely Graywacke or Siltstone variety)
Clastic Sedimentary Rock (SiO2 with assorted mineral fragments)
sedimentary
Category
Metamorphic Or Sedimentary Depending On Local Grade
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Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Black Jasper
Black Jasper (Silicate mineral - SiO2)
sedimentary
Rhodonite
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Yellow Jasper
Silicon Dioxide (SiO₂)
sedimentary
Travertine (Tufa)
Chemical Limestone (CaCO3)
sedimentary
Fossilized Bone
Vertebrate Fossil Fragment (Calcium Phosphate / Hydroxyapatite)
fossil
Pink Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite (Lithic Artifact)
Quartzite (SiO2)
metamorphic
Mica Schist (with Muscovite mica)
Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Chert (Yellow or Ochre Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Fluorite (Blue)
Calcium Fluoride (CaF2)
mineral
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Ferruginous Sandstone (with Laterite)
Ferruginous Arenite (FeO(OH)·nH2O)
sedimentary
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Fulgurite
Fulgurite (Lechatelierite), amorphous SiO2
metamorphic
Chert Nodule (Commonly known as Flint or River Rock)
Silicon Dioxide (SiO2)
sedimentary
Polygenetic Conglomerate (Puddingstone)
Conglomerate (SiO2 matrix with mixed clasts)
sedimentary
Fossilized Bone Fragment
Permineralized Skeletal Element (Likely Vertebrate)
sedimentary
Chert (Quartz Variety)
Microcrystalline Silica (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sandstone (Quartz-rich)
Arenite (composed primarily of SiO2)
sedimentary
Limestone (Concretionary or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Garnet-Mica Schist
Garnetiferous Porphyroblastic Schist
metamorphic
Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
metamorphic
Fragmented Sedimentary Pebble
Clastic Sedimentary Specimen
sedimentary
Calcite with iron staining
Calcium Carbonate (CaCO3)
mineral
Greywacke (River Pebble)
Greywacke sandstone with quartz veining
sedimentary
Fossiliferous Sedimentary Rock (Coquina/Limestone)
Fossiliferous Calcarenite / Bioclastic Limestone
sedimentary
Anthracite Coal
Anthracite
metamorphic
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Diorite
Phaneritic Intermediate Igneous Rock
igneous
Fossilized Bone Fragment
Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)
sedimentary
Ferruginous Sandstone
Arenite with limonite/goethite cement
sedimentary
Chert (Jasper variety)
Microcrystalline quartz (SiO2)
sedimentary
Jasper
Agate/Jasper (Microcrystalline Quartz, SiO2)
sedimentary
Jasper
Jasper (Silica/Quartz) - SiO2
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Kyanite (in Schist Matrix)
Kyanite (Al2SiO5)
metamorphic