These are Shantilite agate large tumbles or pebbles from Madagascar. Some are grey and some with orange. I particular love those showing dendritic growth. As you can see it looks very different to that from South America.
The middle plainer grey agate palm stone shows soft patterning in grey tones and is from Brazil. Dimensions are for it.
The grey form is a rooting crystal, bringing about an emotional, physical and intellectual balance. Use Shantilite agate to aid in centring and stabilising physical energy. It works slower than other agates so great for sensitives but brings great strength.