Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
mineral
Category
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Sandstone (with Lichen)
Arenite (primarily SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Turquoise in Matrix
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in a Geode
mineral
Possible weathered quartz-rich rock or iron-stained mineral fragment
Indeterminate; possibly quartz (SiO₂) with iron-oxide inclusions
mineral
Weathered basaltic cobble
Basalt, likely amygdaloidal or vesicular basalt
igneous
Tumbled basalt (likely)
Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine
igneous
Red Sandstone
Arenite (Iron-rich)
sedimentary
Mica Schist with Garnet
Garnet-Mica Schist
metamorphic
Granite River Pebble
Granite
igneous
Chert Breccia
Brecciated Chert (Microcrystalline Silica, SiO2)
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Amethyst
Silicon Dioxide (SiO2)
gemstone
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Borosilicate Glass (Manufactured)
SiO2 + B2O3 (Silicon dioxide and Boron trioxide)
Synthetic/Amorphous Solid
Quartz-encrusted Matrix
Silicon Dioxide (SiO2) with Ferruginous Sandstone
sedimentary
Diorite
Plutonic Igneous Rock (NaAlSi3O8, CaAl2Si2O8)
igneous
Granodiorite
Granodiorite (containing Plagioclase, Quartz, and K-feldspar)
igneous
Sandstone
Arenite (primarily Quartz and Feldspar composition)
sedimentary
Sandstone
Arenite (primarily Quartz-based)
sedimentary
Banded Gneiss / Metamorphic River Pebble
Gneiss (Foliated Metamorphic Rock)
metamorphic
Green Aventurine (Tumbled)
Silicon Dioxide with Fuchsite Inclusion (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Iron-rich vesicular rock, possibly slag or weathered basalt
Identification uncertain; likely ferruginous basalt/ironstone, with possible anthropogenic iron slag
igneous
Sandstone
Arenite (SiO2 principal)
sedimentary
Aura Quartz (Coated Quartz)
Silicon Dioxide (SiO2) treated with metallic vapor
mineral
Fossilized Bone
Petrified Bone (Fluorapatite / Calcium Phosphate replacement)
fossil
Hematite
Iron(III) oxide (Fe2O3)
mineral
Septarian Nodule (Dragon Stone)
Septarian Concretion (CaCO3 with Calcite, Aragonite, and Limestone/Bentonite)
sedimentary
Geode (unopened)
SiO2 - Chert-shelled concretion (mostly Quartz)
sedimentary
Sandstone (with vugs)
Arenite / Sedimentary Sandstone
sedimentary
River Cobble (Sandstone / Greywacke)
Sedimentary Rock (predominantly Quartz, Feldspar, Lithic fragments)
sedimentary
Green Slate or Metamorphic Rock
Metamorphic rock (chlorite/actinolite-bearing)
metamorphic
Basalt (with possible mineral veining)
Basalt (Aphanitic Mafic Igneous Rock)
Igneous
Jasper
Silicon dioxide (SiO2)
sedimentary
Sandstone (with iron staining)
Quartz Arenite / Ferruginous Sandstone
sedimentary
Jasper (specifically Polychrome or Desert Jasper)
Silicon Dioxide (SiO2) with iron oxide and other mineral impurities
sedimentary (chemical/biological origin)
Granodiorite
Granodiorite (containing Quartz, Plagioclase, Orthoclase, Biotite/Hornblende)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
Mineral in Metamorphic/Igneous Host
Sandstone (with potential Arkose/Lithic characteristics)
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Gabbro
Gabbro
igneous
Concretion
Septarian or Siderite Concretion
sedimentary