Moonstone
Moonstone is the traditional secondary birthstone of June, pearl being the primary one. It is also the zodiac birthstone of people born under the sign…
Cardinal Gemstones: Precious Gems, Jewels & Minerals
Over the centuries, the word “precious” has taken on broader meaning, covering any rare variety of gem that has a correspondingly high value. Today, the…
Sphalerite ZnS
Without doubt, the most difficult mineral to be recovered at the C.E. Duff and Son Inc. quarry is Sphalerite. Sphalerite is generally found as small,…