An included Quartz cabochon from China.

The transparent, colourless Quartz holds a large euhedral Calcite crystal, along with a smaller sister crystal.
The larger yellow-white crystal is a mirrored twin crystal and is speckled with red oxide flecks.
Images 4 to 6 are magnified views of the inclusions in this gem.

The Calcite inclusions sit on a bed of green chloritic Lodolite in this enticing included Quartz gemstone.

weight:  18.70 carats
shape:    Drop shape cabochon
dimensions:   26.67 x 14.61 x 7.84 mm
treatment:  None