An amazingly glowing and gemmy, 2-inch-long, TWINNED, calcite crystal, like cut glass and even throwing off spectral colors, perched on a matrix of quartz. I have never seen an example of this style of twin so nicely perched on matrix!!! They are always loose singles! The calcite is doubly-terminated, and perfect. The crystal also shows beautiful striations on its faces. Its just incredible...i couldn't believe it... 6 x 4.2 x 3.5 cm