Sedimentary (With Some Aspects Of Mineral Replacement)

Chondrite Meteorite

Ordinary Chondrite (Fe-Ni alloy, Olivine, Pyroxene)

Agate (Sliced Nodule)

Silicon Dioxide (SiO2) - Chalcedony variety

Rose Quartz

Silicon Dioxide with trace inclusions (SiO2)

Tourmaline (likely Schorl)

Tourmaline Group Mineral (e.g., Schorl for black varieties); (Na,Ca)(Li,Mg,Fe,Mn,Al)3Al6(BO3)3Si6O18(OH)4

Pegmatite

Pegmatitic Granite

Rose Quartz

Quartz (Silicon Dioxide) - SiO2

Quartz Geode (partially formed/chalcedony with iron staining)

Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Agate (Geode nodule)

Cryptocrystalline Quartz (SiO2)

Peridot

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Quartzite

Hydrothermal Quartz or Quartzite (SiO2)

US Penny

Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy

Amber

Succinite (specifically for Baltic amber); Chemical formula approximately C10H16O

Chrysocolla Chalcedony

Hydrated Copper Phyllosilicate (Cu,Al)2H2Si2O5(OH)4 + SiO2

Serpentinite

Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)

Pegmatite (Granitic)

Granitic Pegmatite containing Quartz, Feldspar, and Tourmaline (Schorl)

Agate (various color varieties)

SiO₂ (Silicon Dioxide)

Schist

Schist (Crystalline metamorphic rock)

Banded Gneiss (River Cobble)

Gneiss (High-grade regional metamorphic rock)

Rose Quartz

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

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Schist

Lepidoblastic Mica Schist

Obsidian

Obsidian (volcanic glass), predominantly amorphous SiO₂

Pearl

Calcium Carbonate (primarily Aragonite and Calcite), CaCO3

Rose Quartz

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

Chalcedony (Agatized Coral / Rough Chalcedony Node)

Silicon Dioxide (SiO2)

Carnelian

Silicon Dioxide (SiO2) - variety of Chalcedony

Pearl

Pearl (Calcium Carbonate with organic conchiolin, CaCO3)

Biotite (Black Mica)

Biotite [K(Mg,Fe)3(AlSi3O10)(F,OH)2]

Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining)

Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.

Garnet (likely Almandine or a blend)

Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.

Pink Opal / Peruvian Opal

Hydrated amorphous silicon dioxide (SiO2·nH2O)

Red Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with Fe2O3 inclusions)

Sunstone

Oligoclase (a plagioclase feldspar variant), (Na,Ca)(Al,Si)4O8

Black Tourmaline (Schorl)

Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3)(OH)3(OH))

Labradorite

Labradorite (Plagioclase Feldspar Series: (Ca,Na)(Al,Si)4O8)

Rose Quartz

Silicon dioxide (SiO2)

Eye Agate

Silicon Dioxide (SiO2) - Banded Chalcedony

Amazonite

KAlSi3O8 (Potassium Aluminum Silicate)

Garnet (likely Almandine or Pyrope)

Garnet Group, Nesosilicates (Complex chemistry, e.g., Almandine: Fe3Al2Si3O12)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)