Heliotrope is a variety of chalcedony, which, in turn, is a variety of opaque quartz, with a typical dark green coloration, with red spots due to iron oxide inclusions. The name derives from the Greek "hēliotrópion", a term composed of "hḗlios" "sun" and "trepein" "turn", with reference to the way this mineral reflects light. Heliotrope is also known as blood stone due to of its red inclusions that should look like bloodstains, for this reason it is also erroneously called bloodstone.
Dimensions
Single stones size (cm):0.4-0.8
Weight (g): 50
Property
Chemical formula: SiO2
Mohs scale: 7
Relative Density: 2.65
Crystal System: Trigonal
