Mineral And Sedimentary

Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.

SiO2 (Silicon Dioxide)

Druzy Quartz on Matrix (likely Limestone or Sandstone)

Silicon Dioxide (SiO2) with various trace impurities

Quartz in Limonite-rich Matrix

Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O

Chalcedony in Limestone Host Rock

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Yellow Jasper

Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite)

Petrified Wood

Silicified Wood (SiO2 - primarily Quartz/Chalcedony/Opal)

Chalcedony Geode

Chalcedony (SiO2) within a geode structure

Quartz (chalcedony variety) or Limestone with Quartz Veins

SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)

Small quartz-rich mineral fragment

Quartz (SiO₂), possibly milky or chalcedonic quartz

Quartz vein fragment

Quartz, silicon dioxide (SiO₂), likely milky to translucent quartz with iron-oxide or clay inclusions

Quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂); if quartzite, recrystallized quartz sandstone

Likely quartz-rich stone (possibly milky quartz or quartzite)

Quartz, silicon dioxide (SiO₂), or quartzite if interlocking grains are present

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Banded Sedimentary Rock

Sedimentary rock with mineral veins/banding

Mixed Mineral and Rock Collection

Mixed geological specimens (Quartz, Amethyst, Rose Quartz, Jasper, Epidote, Chert)

Likely rough quartz with iron-oxide staining

Quartz (SiO₂), possibly with iron-oxide inclusions or surface staining

Likely quartz-bearing rock fragment

Quartz (SiO₂), possibly with iron-oxide staining or other mineral inclusions

Quartz vein in host rock

Quartz (SiO₂), likely milky quartz; host rock is uncertain from the photo

Milky quartz (likely quartz vein fragment)

Quartz, silicon dioxide (SiO₂)

Limonite

FeO(OH)·nH2O

Quartz in Matrix

Silicon Dioxide (SiO2)

Iron-stained quartz (likely quartzite or quartz-rich rock)

Quartz, silicon dioxide (SiO₂), with iron-oxide staining

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Small translucent quartz fragment

Quartz (SiO₂), identification tentative from the image

Limonite

FeO(OH)·nH2O

Quartz crystal-bearing rock

Quartz (SiO₂), likely a milky/clear quartz vein specimen

Clear quartz crystal

Quartz, silicon dioxide (SiO₂)

Pyrite

Iron Sulfide (FeS2)

Clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Raw quartz (likely milky or smoky quartz)

Quartz, SiO₂

Quartz-rich pebble (likely milky quartz)

Quartz, SiO₂

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Clear quartz crystal (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Clear quartz crystal

Quartz (SiO₂), likely a small hexagonal prismatic crystal

Hematite

Iron (III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Tumbled quartz pebble, possibly citrine or pale smoky quartz

Quartz (SiO₂), likely microcrystalline/tumbled material

Likely milky quartz fragment

Quartz (SiO₂)

Small white quartz fragment

Quartz (silicon dioxide, SiO₂)

Clear quartz crystals

Quartz (silicon dioxide, SiO₂)

Quartz crystal fragment

Quartz, silicon dioxide (SiO₂)