Rocks with strange luster

Hello and blessings of God and His mercy be upon you. I have some rocks that have a strange shine, and I don't know their type. I don't want anyone accusing me of fraud, as I am offering them for sale by the gram. Anyone who has knowledge about this matter, please contact me, I would appreciate it. Honestly, I found these rocks in the desert. I thank you all sincerely. I don't know their exact price, but perhaps two riyals per gram, or open to offers.