sedimentary
Painted Sandstone
Sandstone (clastic sedimentary rock) with acrylic/artistic coating
Hardness: 6-7 (quartz-based); Color: Natural tan/brown covered by artificial rainbow pigments; Luster: Dull (natural) to matte (paint); Structure: Granular/Clastic; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (quartz-based)
- Color
- Natural tan/brown covered by artificial rainbow pigments
- Luster
- Dull (natural) to matte (paint)
Identified More sedimentary →
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Physical properties
Hardness: 6-7 (quartz-based); Color: Natural tan/brown covered by artificial rainbow pigments; Luster: Dull (natural) to matte (paint); Structure: Granular/Clastic; Specific Gravity: 2.2-2.8
Formation & geological history
The base rock formed via the accumulation of sand-sized mineral grains or rock fragments, cemented over geological time. The surface rainbow pattern was applied recently by human hand using paint or markers.
Uses & applications
Decorative art, craft projects, kindness rock gardens, or personal mementos. As a source material, sandstone is used in construction and paving.
Geological facts
Sandstone makes up about 10-20% of Earth's sedimentary rocks. This specific specimen has been modified as a 'Kindness Rock,' a popular global movement involving painting rocks and leaving them for others to find.
Field identification & locations
Identify by granular texture and visible layers. Painted specimens are easily recognized by vibrant, non-natural colors and brushstrokes. Common in riverbeds and arid landscapes before human modification.
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