Category: Gem Notes

Jeremejevite

Introduction: Jeremejevite is not well known among the general public and it is safe to say, it is not a common gem seen or familiar within the gem and jewelry industry. Unlike many gems within the…

Wulfenite

INTRODUCTION Wulfenite is a mineral species crystallizing in the tetragonal system, lead molybdate, with the formula PbMoO4. It was named after the Austrian mineralogist, Franz Xavier Wulfen. Wulfenite is almost always found as thin, tabular crystals…

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.