The violet and purple varieties of quartz provide the most prized and in many respects the most interesting of the large family of quartz minerals. Amethyst, the name by which this variety of quartz is known, is of ancient derivation. Pliny stated that the gem was so called from the colour being near to, […]
Tektites are still poorly understood. They are irregularly - and at times elaborately - shaped nodules and blobs of a glassy substance. They have no crystal structure and are therefore similar to obsidian, but are not associated with volcanic processes.
Their chemistry is unique and unexplained. The leading theory concerning their origin is the […]
Citrine is a variety of quartz, the colour being in the range from yellow to golden brown to burnt amber. Natural citrine (yellow quartz) is not common and occurs only sparingly in many large quartz deposits. As such it is greatly prized by crystal therapists and healers. Most of the yellow and brownish-yellow quartz, […]