on Silva's website 'Oldbeads' on 'the Americas including preColumbian' pages. This is the link http://www.oldbeads.com/americas.html

She mentions on AM797 of which I am including a picture: '... These beads and pendant are all preColumbian greenstone from the State of Guerrero....'. There are some more on this page that look alike.

I see similarities with my beads: some have flatten sides, and more oval like beads, there is that same colour and stone structure.

I would appreciate your opinion.
Could my beads (see pictures on the previous lines of this string) be preColumbian greenstone from the State of Guerrero, and what is this greenstone? Or are they newer? Still what is this greenstone.
Thank you!