Natural quartz repaired by Synthetic Silicon Dioxide - Baltimore, USA - Before repair: 8 cm x 5.5 cm x 3.7 cm, after repair: 13.2 cm x 7.6 cm x 8.8 cm

Mineral: Natural quartz repaired by Synthetic Silicon Dioxide
Locality: Baltimore, Maryland, USA
Dimensions: Before repair: 8 cm x 5.5 cm x 3.7 cm, after repair: 13.2 cm x 7.6 cm x 8.8 cm

Description: The second specimen (JKB209) is a specimen of natural quartz from Baltimore, Maryland, United States. This specimen was a fairly ordinary chunk of clear quartz, that had been obviously been fractured by tectonic forces and had partially frosted edges. Vlad inspected the piece and informed me he would attempt to try and regrow it. This is the result of this experiment.A rather unusual outcome here is that when I received the specimen back, I noticed under an ultraviolet light that the specimen did actually fluoresce a yellow color. I believe that the original specimen must have had some accessory mineral that did not dissolve in the autoclave! This certainly surprised everyone, because we all assumed that most accessory minerals would have dissolved under those conditions. I believe this mineral may be wollastonite.