Roger Weller, geology instructor
calcite-modified scalenohedron crystal-1
Originally, a very sharp scalenohedron crystal (dogtooth spar) formed. There must
have been a break in the crystallization process and then a change in the chemistry
of the mineralized solution, because a different type of calcite crystal, distinguished
by a termination of three low angle faces, started growing on top of the
Photo is copyright free only for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.