If you don't understand what the symbol means, you will soon realize it by your self.
The following pages are very incomplete, but I couldn't resist putting it out on the net.
The mineral index is split into ten subclasses depending on their chemical
composition and on the structure of the mineral. I am following the same
system for division in classes and subclasses as the book "Mineral i Sverige", Lars-Håkan
Hedin, Bonniers fakta 1985, ISBN 91-34-50581-4. This book is based on the east German
geolog professor H.J. Röslers system.
There will be some more index in the future, like fluorescent minerals, tables for identification and so on, but that's for some rainy day in the future.
The background is a piece of rosy quartz, probably from Ytterklippen,
a pegmatite 80 km from Umeå. I found it at the backyard together with some
other stones, but that's a totally different story.
If you have some questions, suggestions or comments you are welcome to write me a line or two.