How Opal’s Play-of-Color Works
Before explaining how opal’s play-of-color works, I’ll need to review a few definitions you may not have encountered since school. […]
Presentations
- 02A – Sulfides
- 02F – Arsenides
- 03 – Halogenides
- 05A – Carbonates
- 06 – Borates
- 07E-G – Molybdates
- 08B-C – Arsenates
- 09 – Silicates
- 09A – Neosilicates
- 09B – Sorosilicates
- 09C – Cyclosilicates
- 09D – Inosilicates
- 09E – Phyllosilicates
- 09F – Tectosilicates
- 10 – Mineraloids
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Pink Quartz
Rose Quartz There are three types of pink-colored quartz. The first and most common is rose quartz. Rose quartz forms […]
Toxic Minerals
This is a presentation I gave to the Ozark Mountain Gem & Mineral Society on 25 April 2022. Please click […]
Petoskey Stone
I gave a pared-down version of this presentation on the Petoskey Stone, Michigan’s state stone, to the Ozark Mountain Gem […]