As – Arsenic

products and information
These rocks could make a good representative sample for your collection, but wash your hands after handling
Arsenic is a poison, so without the desire to collect with knowledge to handle safely, maybe consider another rock?

Agardite-Nd
Hutchinsonite with Realgar
Nickeline with minor Annabergite
Zeunerite with Metazeunerite
Nickeline & Annabergite
Parapierrotite on Realgar
Renierite
Skutterudite
Sperrylite
Tennantite
Wulfenite

& Many more added and still to come!

According to mindat, there are 805 known minerals containing Arsenic.

From Wikipedia:

According to wikipedia –