Category: Gem Notes

Kyanite

Kyanite can be extremely attractive as mineral specimens (Figure 1) and is actively sought after by collectors.

Aragonite & Calcite

Just as graphite and diamond have the same chemical composition but crystallize in two different systems, so is the case with aragonite and calcite

Zincite

To complicate matters, zincite can be and has been intentionally synthesized in a laboratory. Many years ago, synthetic zincite was used as semi-conductor crystal detectors in radios before the advent of vacuum tubes.

Cerussite

Cerussite is a mineral species, lead carbonate, with the formula PbCO3. It crystallizes in the orthorhombic system. It is an important ore of lead.

Phenakite

Of all the colorless “rare gems,” phenakite is perhaps the most desirable of almost all of its colorless counterparts for several reasons.

Pink Diaspore

Much of the pink diaspore rough seen to date has areas capable of cutting medium to large size stones that are eye clean and in many cases loupe clean

Scapolite – Fluorescence

I first reported on scapolite as a rare stone becoming part of the jewelry landscape back in the September/October 2009 issue (Volume 28, Issue 5). The mineralogical prop- erties are being repeated below for reference. (Ed. Note: subscribers can log in to the website, go to News and Cur- rent Publication, and search on the archives—Scapolite— to find this article in entirety.)