Metamorphic or Sedimentary (with staining)

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.

Hardness: Quartzite (7 on Mohs scale), Sandstone (6-7 depending on cement); Color: Vibrant pink/purple due to staining, otherwise white, gray, tan; Luster: Vitreous to dull; Crystal structure: Granular, interlocking crystals in quartzite, clastic in sandstone; Cleavage: None; Specific Gravity: 2.65 for quartz.

Luster: Vitreous to dull

Identified December 5, 2025More metamorphic or sedimentary (with staining) →

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Physical properties

Formation & geological history

Quartzite forms from the metamorphism of sandstone, typically under intense heat and pressure. Sandstone forms from the lithification of sand grains. The pink/purple color is a secondary feature, likely from iron-rich fluids that have stained the rock over time. These fluids could be from weathering of nearby iron-bearing minerals or hydrothermal alteration. Geological age varies greatly depending on the original sandstone and metamorphic event, ranging from Precambrian to Cenozoic.

Uses & applications

Quartzite is used as a building material, in road construction, and as a decorative stone due to its hardness and aesthetic appeal. Stained varieties like this could be used for ornamental purposes. Sandstone has been widely used in construction, especially for historical buildings.

Geological facts

The intense pink/purple color is quite striking and is often due to the presence of manganese or iron (hematite, goethite) oxides, which act as a natural pigment. In some cases, minerals like Piemontite can also cause pinkish hues in metamorphic rocks. While the exact cause of this specific coloration would require chemical analysis, iron oxides are a common culprit for red, pink, and purple staining in many rocks.

Field identification & locations

In the field, look for a very hard rock that scratches glass (if quartzite) or feels gritty (if sandstone). The vivid pink/purple color is its most distinguishing feature in this instance. It might be found in areas with past hydrothermal activity or where iron-rich soils or rocks are present. Commonly found where sandstone formations occur or meta-sedimentary terrains. Collectors might value such a specimen for its unusual and vibrant color.

Other metamorphic or sedimentary (with staining) specimens

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Quartz (Drusy/Crystalline)

Silicon Dioxide (SiO2)

mineral

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

mineral

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Mineral

Milky Quartz (Ferruginous variety)

Silicon Dioxide (SiO2)

mineral

Quartz

Silicon dioxide (SiO2)

Mineral

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

mineral