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FAQ
Questions
- Which sources do the mineral cards use?
- Handbook of Mineralogy species PDFs (Mineralogical Society of America), Webmineral mineral data, and USGS silica, fluorspar, and volcano pages. Links live on each kind card and in the guides.
- Is obsidian a crystal?
- USGS describes obsidian as volcanic glass that cooled too fast to crystallize. We file it with the stones people group as crystals and cite the Yellowstone volcano pages.
- How should I identify a stone?
- Start with habit and hardness, then open the species page. Identify a mineral walks quartz (Mohs 7), fluorite (Mohs 4), and obsidian. Color last: GIA notes most citrine is heated amethyst.
- What is on Goods?
- Goods is décor, jewelry, and culture objects. Singing bowls, spheres, selenite trays. Mineral ID stays on kinds and tools. Cavern walks: cited parks.