Live session #9 Mica’s

rolf 27 September 2024

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Recorded live session in which I discuss and show minerals from the micaceous or mica group. I begin with a brief introduction about properties of micaceous minerals and their occurrence as rock-forming minerals in e.g. granite, schist and gneiss. Then well-known and less well-known glimmers pass by: chlorite, clinochlorite, kämmererite, celadonite, paragonite, margarite, polylithionite, (tetraferri)flogopite, zinnwaldite, biotite and muscovite (including the varieties fuchsite and allurgite). I end the session with a very special variety of muscovite/mica: Cherry Blossom Stone from Japan!….

Categories: Video

Tags: biotite, celadonite, cherry blossom stone, chlorite, fuchsite, mica, sparklers

rolf

Tips for visiting a mineral show

Mineral shows are a melting pot of passion, knowledge and discovery. If you have ever visited a mineral show, you know it is a unique…

rolf 11 October 2024

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Names of minerals and gemstones

Why is correct naming of gemstones and minerals important? Commercial names and fancy names can cause confusion. It also highlights legal aspects and examples of misleading marketing. Read more about standards such as those set by the IMA and CIBJO to promote uniform nomenclature.

rolf 7 May 2025

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Typical geodes

In this article, we explore the fascinating world of geodes, hollow spaces in rocks filled with beautiful minerals such as chalcedony, agate, and quartz. Well-known examples include the amethyst geodes from Brazil and the Las Choyas “coconut” geodes from Mexico. We also discuss lesser-known but unusual varieties such as the Puma agates and Red Fox agates from Argentina, and the Dugway geodes from Utah, USA. Discover how the locality and composition of geodes give them a unique identity, and learn about the local names and typical features that set them apart.

rolf 27 September 2024

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