Admin 05 January

A fundamentals of optical mineralogy is that the majority minerals even dark colored minerals et al.   We use a pola…

Admin 26 December

Determining the optic sign from an principal axis figure can often be simpler than trying to hunt out a Bxa. to hunt …

Admin 08 October

An Updated and Extended Mohs Mineral Hardness Scale Friedrich Mohs (1773-1839), an Austrian/German mineralogist, …