Photo category: Rocks and Minerals specimen collection
- Photo taken Locality: Greece, Crete
- Photo taken by: Trichas, A.
- Photo taken date: October 2011
Photo of a sample of a Chert, collected in Arvi of Heraklion, Crete, Greece. It is a sedimentary rock. It is a very hard and very massive rock. It consists mostly of amorphous silica with various impurities (hematite, calcite, clay minerals). Its color varies from deep red to maroon.