metamorphic

Blue-dotted quartzite (likely blue quartz)

Quartzite; predominantly quartz (SiO₂), with minor blue inclusions or fibrous minerals

AI-generated identification · may be incorrect

White to translucent, massive, vitreous to sugary luster, irregular fracture, and no obvious cleavage; quartz hardness is Mohs 7, with specific gravity around 2.65. The blue areas may be dumortierite, riebeckite, or other microscopic inclusions, but the image alone cannot confirm them.

Identified September 6, 2026More metamorphic →

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At a glance

Common name: Blue-dotted quartzite (likely blue quartz)
Scientific name: Quartzite; predominantly quartz (SiO₂), with minor blue inclusions or fibrous minerals
Category: metamorphic
Identified: September 6, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a small common specimen; $40–$150+ for attractive, vividly blue, well-formed or polished material.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Formed when quartz-rich sandstone recrystallized under metamorphic heat and pressure, commonly during Precambrian to Paleozoic mountain-building. Blue coloration results from included minerals or trace impurities.

Uses & applications

Used as decorative stone, lapidary material, countertops, carvings, and collectible specimens; gem-quality blue quartz may be cabochon-cut.

Geological facts

Quartzite is generally tougher and more resistant to weathering than its sandstone precursor. The specimen could also be a blue-included quartz rather than true quartzite if it lacks visible metamorphic granulation.

Field identification & locations

Identify by testing hardness against glass, observing a sugary granular texture, and checking for weak or absent cleavage; it should not fizz in dilute hydrochloric acid. Common sources include Brazil, India, Madagascar, and the United States.