Invest in some books on basic mineralogy. ID’ing from pictures is really not possible… this line has been repeated by numerous people on this website.
the Simon and Schuster field guide of Minerals and Rocks, the Simon and Shuster Field Guide to Gems are very useful resources… They give you the physical and optical properties of the common minerals and gems. Most gems are cut from large monomineralic crystals. Others like your specimen can be multimineralic, making it a rock… the dominant mineral in the green part of your stone will determine what to call it…crptocrystalline material is the most difficult to identify unless it’s monomineralic as with agate or other quartz stones. Theses are the most difficult to identify. Your speciment could very well be emerald but also aventurine or green quartz… A local geologist/mineralogist if there is a university in your area is a place to start. Absent a university, a brick and mortar store gemologist might be able to ID your sample for you…