mineral

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white with reddish-brown and grey streaks; Luster: Vitreous to greasy; Crystal Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white with reddish-brown and grey streaks
Luster: Vitreous to greasy

Identified May 4, 2026More mineral →

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Physical properties

Formation & geological history

Formed from hydrothermal veins or cooling magma where excess silica crystallizes. The reddish staining is likely due to the oxidation of iron minerals (hematite or goethite) within or on the surface of the quartz.

Uses & applications

Mainly used as a decorative collector's piece or for lapidary work. High-purity quartz is used in electronics and glass manufacturing.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Specimens with iron oxide inclusions are often called 'Ferruginous Quartz' or 'Hematoid Quartz'.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and translucent to opaque milky white body color. Common worldwide in igneous and metamorphic environments.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral