Sedimentary (Chemically Precipitated Mineral)

Chrysocolla

(Cu,Al)2H2Si2O5(OH)4·nH2O

Banded Chert (Jasper) River Pebble

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Yellow calcite

Calcite (CaCO₃), likely honey or amber calcite

Tumbled honey calcite

Calcite (calcium carbonate, CaCO₃)

Red Jasper

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Banded chert (jasper-like chert)

Microcrystalline quartz (SiO₂), likely iron-oxide-stained chert

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Banded Iron Formation (BIF)

Magnetite-hematite-chert formation

Raw honey calcite

Calcite (calcium carbonate, CaCO₃)

Septarian Nodule (Thunder Egg variant)

Septarian concretion (Calcite, Aragonite, and Limestone)

Chert (Flint)

SiO2 (Microcrystalline Quartz)

Red Jasper

SiO2 (Microcrystalline Quartz)

Quartz-rich translucent pebble, possibly iron-stained quartz or chalcedony

Quartz (SiO₂), potentially microcrystalline quartz (chalcedony)

Milky quartz vein fragment

Quartz (silicon dioxide, SiO₂), massive or granular variety

Tumbled chalcedony (likely milky quartz)

Microcrystalline quartz, SiO₂; possibly pale agate or quartzite

Rounded ironstone concretion

Iron-oxide-cemented sandstone or siltstone concretion, commonly hematite/goethite-bearing

Likely milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Banded iron formation (BIF)

Banded iron formation; chiefly hematite/magnetite and microcrystalline quartz (chert)

Chert (Jasper/Quartzite river pebble)

Microcrystalline Silica (SiO2)

Chert (White Variety)

Silicon Dioxide (SiO2)

Chert (Red Jasper)

Microcrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide with iron inclusions (Quartz variety)

Ferruginous Sandstone

Arenite with Iron-oxide cement (composed of Quartz and Limonite/Hematite)

Weathered iron-rich rock, possibly limonite-bearing quartzite or altered basalt

Indeterminate; likely quartz (SiO₂) with iron oxides/hydroxides such as limonite/goethite

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Quartz pebble with a conchoidal chip

Silicon dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (iron-rich)

Fluorite

Calcium Fluoride (CaF2)

Banded iron formation fragment (likely hematite–magnetite ironstone)

Banded iron formation; chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and microcrystalline quartz (SiO₂)

Selenite (gypsum)

Gypsum, CaSO₄·2H₂O; fibrous variety often called satin spar

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Banded iron formation (iron-rich jasper/chert)

Banded iron formation, composed mainly of hematite–magnetite with microcrystalline quartz (jasper/chert)

Calcite crystal specimen

Calcite — calcium carbonate, CaCO₃

Orange calcite

Calcite, calcium carbonate (CaCO₃)

Galena

Lead(II) sulfide (PbS)

Likely quartz pebble

Quartz (SiO₂), possibly milky or iron-stained quartz

Hematite-rich ironstone concretion

Hematite (Fe₂O₃), likely mixed with goethite/limonite and silica

Banded Chert / Flint

Silicon dioxide (SiO2)