sedimentary (base), then artificial
Dyed Agate / Painted Stone
Silicon Dioxide (SiO2) with artificial pigment
Hardness: Approx 6.5-7 (if silica-based); Color: Vivid sky blue (unnatural); Luster: Waxy to dull (due to dye/paint coating); Crystal structure: Microcrystalline; Cleavage: None/Conchoidal
- Hardness
- Approx 6
- Color
- Vivid sky blue (unnatural)
- Luster
- Waxy to dull (due to dye/paint coating)
Identified More sedimentary (base), then artificial →
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Physical properties
Hardness: Approx 6.5-7 (if silica-based); Color: Vivid sky blue (unnatural); Luster: Waxy to dull (due to dye/paint coating); Crystal structure: Microcrystalline; Cleavage: None/Conchoidal
Formation & geological history
Usually a naturally occurring river pebble or chalcedony nodule that has been artificially colored through dyeing or spray painting. The base rock is typically millions of years old, but the blue appearance is modern and man-made.
Uses & applications
Commonly used as decorative 'landscaping' rocks, aquarium gravel, or children's 'souvenir' gems in gift shops.
Geological facts
Naturally occurring rocks almost never exhibit this specific shade of uniform neon sky blue across a smooth water-worn surface. The color is usually concentrated on the surface and will scratch off to reveal a white or gray stone underneath.
Field identification & locations
Identify in the field by checking for unnaturally vibrant, uniform color that appears 'caked' on or fills small pits in the stone. Look for white patches where the paint has chipped away at the edges. Not a valuable geological find.
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