Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Flint variety)
Microcrystalline quartz (SiO2)
sedimentary
Mica Schist
Schist (primarily Muscovite and Biotite mica)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz (Water-worn pebble)
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphosed Sandstone (mainly SiO2)
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Limestone with Quartz/Calcite Veins
Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)
sedimentary
Greenstone / Greenschist
Chlorite schist / Meta-basalt
metamorphic
Quartz with Mica (Gneissic or Pegmatitic origin)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(F,OH)2)
metamorphic
Milky Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Veined Basalt Pebble
Amygdaloidal Basalt with Quartz (SiO2) veining
igneous
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Shale
Lutaceous Sedimentary Rock
sedimentary
Greywacke with Quartz Vein
Matrix: Impure Sandstone (SiO2 + varied clasts), Veins: Quartz (SiO2)
sedimentary
Orthoclase (Potassium) Feldspar in Quartz
KAlSi3O8 (Potassium Aluminum Silicate)
igneous
Graphic Granite
Graphic Granite (a variety of Pegmatite)
igneous
Rock Crystal Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Peach Moonstone
Orthoclase Feldspar (KAlSi3O8) with inclusions
mineral
Graphic Granite
Graphic Granite (Quartz/Feldspar intergrowth)
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pumice
Highly vesicular rhyolite/dacite (Amorphous glass)
igneous
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Diorite
Diorite
igneous
Banded Gneiss (with Quartz Vein)
Gneiss (Metamorphic rock of varying mineralogy)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Amber
Succinite
Organic (Mineraloid)
Unakite
Epidotized Granite
metamorphic
Unakite
Epidotized Granite
metamorphic
Amber
Succinite (fossilized resin, C10H16O)
mineral
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic