Granite
Granite
igneous
Category
Organic (Often Found By Beachcombers)
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Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz Vein in Host Rock (Likely Slate or Shale)
Hydrothermal Quartz (SiO2) in Pelitic host rock
metamorphic
Banded Sandstone (Hag Stone)
Arenite Sandstone (SiO2 with impurities)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz in Limonite-rich Matrix
Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O
Mineral in Sedimentary/Secondary host
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Banded Agate (specifically Sardonyx or Carnelian Agate)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Chert (Yellow or Tan Chert)
Silicon Dioxide (SiO2)
sedimentary
Hag Stone
Calcareous sedimentary rock (often Chert, Flint, or Limestone)
sedimentary
Milky Quartz with Chlorite/Epidote
Silicon Dioxide (SiO2) with phyllosilicate or sorosilicate inclusions
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Scoria
Scoria (Vesicular Basaltic Glass)
Igneous
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Gravel Pebble)
Silicon Dioxide (SiO2)
mineral
Iron-Nickel Meteorite (Possible Chondrite or Oxidized Iron)
Siderite (Nickel-Iron) or Chondrite (Si/Fe composite)
igneous
Vesicular Basalt (Scoria)
Basalt with vesicular texture
igneous
Chert (Nodular Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Quartzite
Quartzite (Primary mineral: Silicon Dioxide, SiO2)
metamorphic
Amazonite
Microcline (K(AlSi3O8))
mineral
Ironstone concretion
Siderite or Limonite concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Chrysocolla on Quartz
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) with Quartz (SiO2)
mineral
Ironstone Concretion
Siderite or Hematite-rich Concretion (FeCO3 / Fe2O3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Hematoid Quartz
Ferruginous Quartz (SiO2 with Fe2O3 inclusions)
mineral
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Malachite in Host Rock
Malachite - Cu2CO3(OH)2
mineral
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Copper Ore (with Malachite and Azurite)
Hydroxide copper carbonate (Cu2CO3(OH)2 / Cu3(CO3)2(OH)2)
mineral
Serpentine
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite Pebbles
Crystalline silica rock (SiO2)
metamorphic
Gold Nugget
Native Gold (Au)
mineral
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Jasper, possibly Brecciated Jasper or Ocean Jasper due to patterns and color
Silicon Dioxide (SiO2), a variety of Chalcedony
Sedimentary Rock
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary