Mineral, Specifically A Variety Of Quartz

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with iron oxide Fe2O3 cement)

Citrine

Citrine (Silicon Dioxide - SiO2)

Raw Citrine (Yellow Quartz)

Citrine / Silicon Dioxide (SiO2)

Dendritic Opal (Common Opal)

Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions

Serpentine

Antigorite/Lizardite (Mg,Fe)3Si2O5(OH)4

Agate (specifically, multi-colored or pastel-dyed agate)

Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).

Amygdaloidal Basalt with Epidote/Chlorite

Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))

White Quartz (Milky Quartz Mushroom)

Silicon Dioxide (SiO2)

Blue Sapphire

Corundum (Al2O3 with trace amounts of iron and titanium)

Blue Quartz (Blue Aventurine)

Silicon Dioxide (SiO2) with inclusions (typically crocidolite or dumortierite)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Dalmatian Stone

Dalmatian Stone (a fine-grained igneous rock, often misidentified as Dalmatian Jasper)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Blue Quartz (specifically Dumortierite Quartz)

SiO2 (Silicon Dioxide) with inclusions of AlAl6BSi3O18 (Dumortierite)

Jasper (specifically Owyhee or Picture Jasper variety)

Jasper (Silicon Dioxide, SiO2)

Amethyst

Amethyst (SiO2 - Silicon Dioxide with iron impurities)

Quartz (likely) or a Quartzite Pebble

Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.

Milky Quartz

Silicon Dioxide (SiO2)

Jasper, possibly Brecciated Jasper or Ocean Jasper due to patterns and color

Silicon Dioxide (SiO2), a variety of Chalcedony

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Seraphinite

Clinochlore (a variety of the chlorite group)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Red Jasper (possibly banded)

Silicon Dioxide (SiO2) with iron oxide inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with Iron inclusions

Red Jasper (Chert)

Silicon dioxide (SiO2) with iron oxide inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Aquamarine

Beryl (Be3Al2Si6O18)

Moonstone (Green Moonstone / Garnierite)

Potassium Aluminum Silicate (KAlSi3O8) with inclusions of Garnierite

Selenite

Gypsum (CaSO4·2H2O), specifically the crystalline variety Selenite

Orbicular Jasper (Ocean Jasper)

Silicon Dioxide (SiO2) with iron and magnesium inclusions

Quartz (specifically Milky Quartz/Quartzite)

Silicon Dioxide (SiO2)

Carnelian

SiO2 (Silicon Dioxide) - Translucent reddish-brown variety of Chalcedony

Moonstone

Adularia (orthoclase feldspar variety)

Milky Quartz

Silicon Dioxide (SiO2)

Basalt with Epidote Veining

Basalt (Mafic Extrusive Rock) with Ca2(Al,Fe)3(SiO4)3(OH)

Chert (specifically Gray Chert)

Chert (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Desert Rose

Gypsum (variety Selenite) - CaSO4·2H2O