Various Geological Rock Samples
Image: <a rel="nofollow" class="external text" href="https://www.flickr.com/people/30084118@N00">Gennady Grachev</a> from Moscow, Russia (CC BY 2.0)
Mineral NameVarious Geological Rock Samples
Chemical FormulaVaries by rock type; predominantly silicates and carbonates
Mohs HardnessVaries (e.g., 3-7 on Mohs scale depending on constituent minerals)
Streak ColorVaries (white, light grey, reddish-brown)
CleavageVaries (e.g., good in feldspar, poor in quartz, perfect in calcite)
FractureVaries (conchoidal, uneven, hackly)
Specific GravityVaries (e.g., 2.6-3.0)
Colorsreddish-brown, grey, white, pink, black
TransparencyOpaque
Type LocalityVDNKh, Moscow (display location); geological origins of samples vary widely
Mineral GroupSilicates, Carbonates, Oxides (Varies)
Usesbuilding and construction, monuments and sculpture, educational display
Associated Mineralsquartz, feldspar, mica, calcite, hornblende
Description
A diverse collection of large, roughly cut and natural rock samples, exhibiting a range of colors from reddish-brown to grey and white, displayed outdoors on a paved area.
Geological Context
These samples represent common rock types from various geological formations, likely including igneous rocks like granite and metamorphic rocks such as marble or gneiss, used for public education on geology.
