Mineral

Blue Sphalerite (likely dyed or treated Druzy Quartz/Agate)

Zinc Sulfide (ZnS) or Silicon Dioxide (SiO2) with trade-name enhancement

AI-generated identification · may be incorrect

Hardness: 3.5-4 (Sphalerite) or 7 (Quartz); Color: Indigo blue with vuggy/pitted texture; Luster: Adamantine to resinous; Crystal structure: Isometric or Hexagonal; Cleavage: Dodecahedral.

Hardness: 3
Color: Indigo blue with vuggy/pitted texture
Luster: Adamantine to resinous

Identified May 9, 2026More mineral →

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Physical properties

Hardness: 3.5-4 (Sphalerite) or 7 (Quartz); Color: Indigo blue with vuggy/pitted texture; Luster: Adamantine to resinous; Crystal structure: Isometric or Hexagonal; Cleavage: Dodecahedral.

Formation & geological history

Formed in low-temperature hydrothermal veins or replacement deposits in limestone. This specific blue hue is often a trade name for material sourced from Indonesia or treated material from Madagascar.

Uses & applications

Primarily used as metaphysical specimens, collector points, and for lapidary work in decorative objects.

Geological facts

Natural blue color in minerals is rare; while blue sphalerite exists, many of the 'indigo' towers seen on the market are quartz-based materials or heavily included ores. Sphalerite is the primary ore for zinc.

Field identification & locations

Identify by its heavy weight (high specific gravity if sphalerite) and the presence of small 'druzy' vugs or pits. Look for the characteristic indigo color that doesn't occur in standard gray or black varieties.