A daily journal of quartz and crystals

Minerals

Minerals

Mohs Hardness in Practice: Testing Minerals Without Damaging Specimens

Minerals

Mohs Hardness in Practice: Testing Minerals Without Damaging Specimens

Mohs hardness testing can identify minerals and narrow unknowns, but only if scratches are made on inconspicuous...

Fluorescent Minerals: What They Are and How to Test Them Safely

Minerals

Fluorescent Minerals: What They Are and How to Test Them Safely

Fluorescent minerals absorb invisible ultraviolet light and hand it back as visible colour. Here is why that...