Tags » Mineralogy


05-24. Iolite – cordierite #4

From a resource by T. Armbruster, study of an iolite crystal.



05-20. Tourmaline – elbaite #7.

From a resource by Nuber & Schmetzer. An elbaite from Zambia.

Applied Sciences

Crystals, Rocks, Minerals, What Exactly Are They?

What exactly is a crystal, rock and a mineral?  This is something that many people struggle to answer when asked and I hope this article makes things a little clearer.   1,286 more words

Stone Mania


05-08. Tourmaline – dravite #2.

Dravite polyhedra and atom unit cell on a tourmaline background.

From a resource by Foit & Rosenberg – vanadium-bearing tourmaline.

Applied Sciences


05-07. Tourmaline – dravite #1.

Tourmaline will be the mineral of week #19 & 20 of this – 52 grain of sand – journey.

Tourmaline is not a single mineral, but a group of 32 closely related minerals sharing the same chemical structure. 149 more words

Applied Sciences

Nested Rings

The perception of present priorities change with time,  intrinsic and external factors, reshaped conditions. A gathering relevant to climate mutation and natural resources, stimulates interest to research anthropological and scientific literature, related to the topic. 1,061 more words

Geo-pic of the Week: Accessory Minerals

(FOV approx. 2 mm, photo by Corbin Cannon)

Accessory minerals are minerals found in igneous rocks that are not used for the classification or naming of the rock. 153 more words

GeoPic Of The Week