The central museum of our prefecture holds the exhibition of many useful minerals and rare ones during the summer holiday of schools. 

This is "pyrite" combined with iron (Fe) and sulfur (S). As people in old days saw its yellowish color and often thought this mineral was gold, pyrite was called "fool's gold". Pyrite has a cubic crystal system. I am always surprised at its artificial looking big cube.
Here you are. The is "natural gold nugget".
All gold medals at Tokyo Olympics were made from gold used in industrial components such as circuit boards and connecters. Is it possible for humans to discover or make a new element that is more beautiful than gold which was called "sweat of the sun" in the Inca Empire?
In this exhibition, I realized many ores contain sulfur. Have you ever seen this ore? Cinnabar (mercury sulfide) is combined with mercury (Hg) and sulfur (S). Chinese alchemy used this to make a medicine of perpetual youth. It is horrible to take a medicine of mercury.
In many countries, this reddish ore has been used to make a vivid vermilion pigment.
























