Category: Gem Notes

Johachidolite

INTRODUCTION Johachidolite is a very rare mineral of a borate group. Thismineral was first discovered by Japanese scientists E. Iwase and N. Saito in 1942 in the territory of occupiedKorea, in a place that in the…

Tenebrescent Zircon

Zircon is a well-known gemstone that is available in a variety of colors from many worldwide locations. Not very well-known is the variety known as tenebrescent zircon. Tenebrescence, also known as reversible photochromism, is defined as…

Hiddenite

Spodumene that is green in color is often sold under the name “hiddenite.” In the strictest sense, the term hiddenite refers to pale green to emerald green transparent spodumene colored by chromium from Alexander County…

Maxixe Beryl

Maxixe (pronounced mah-she-she) beryl is not frequently seen in the market but when it does occasionally surface, it can cause a bit of confusion. It is a distinct variety of beryl that is commonly mistaken…

Daylight Fluorescent Opal

Semi-transparent to transparent opal that is capable of being faceted is not unusual. Most are familiar with the cherry opal from Mexico, ranging in color from a yellowish- orange to reddish-orange, some with a play…

Vayrynenite

Väyrynenite [´vjairənə,nait] is an exceedingly rare manganese- beryllium phosphate mineral with chemical formula of Mn2+Be(PO4)(OH,F). Initially it was found by a Finnish mineralogist of Russian origin Oleg von Knorring (1915-1994) in Viitaniemi, Finland in 1939…

Grandidierite

Grandidierite has been a rare collector’s stone since its discovery in Tuléar Province, Madagascar at the end of the 19th century. It is a nesosilicate with a chemical formula of (Mg,Fe)Al3(BO4)(SiO4)O and crystalizes in the…

Jeremejevite

INTRODUCTION Jeremejevite is a mineral species with the formula,  Al6B5O15(OH,F)3. It is pronounced by replacing the “J” with “Y” so phonetically, it would be “yeremeyevite.” It was first discovered in 1883 on Mt. Soktuj in East…

Rhodochrosite

Rhodochrosite has been used as an ornamental material for carvings, beads and inlays due to its low hardness, for a very long time. Beautiful pink color contrasting with white banding in massive form is the…

Iolite

INTRODUCTION Iolite is the trade name for gem quality cordierite, a mineral species in the orthorhombic system, with the formula, (Mg,Fe)2AL4Si5O18. Cordierite has been known for hundreds of years and was named in 1813 after…