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Live session #21 Agate

rolf
rolf 27 September 2024
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Recorded live session in which I discuss and show examples of the colorful mineral agate. Agate is a banded variety of chalcedony, which in turn is a variety of the mineral quartz. Featured are known growth forms of agate, in cavities/geodes in volcanic rocks and in thundereggs or lythophyses. I further show, among other things, examples of iris agate, crazy lace agate, Trümmer Achat, Botswana agate, Black Forest agate, breccia agate and the unusual angular polyhedron agate.

In live session #3, agate was already briefly discussed as one of the different types of quartz.

I did another live session on agate in 2025, which you can watch back here.

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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
rolf 27 September 2024
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boulderopaal australie 1

Opal

Opal is a natural hydrated silica with the chemical formula SiOâ‚‚ – nHâ‚‚O and belongs to the mineraloids – substances that have much in common…

rolf
rolf 12 September 2025
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