This is ONE Out of this world piece.   I've not seen anything like it.
Agate is a banded variety of Chalcedony that comes in endless colours and hues.
 
Measurements (approximately)
Height 17cm
Width 6.5cm x 1.5cm
 
Weight  
400 Grams
 
Metaphysical
The colours in this piece come across very sultry and of the night to me.  Then there is the Stunning SPARKLE of the druze and pretty lace patterns.  So, I would use this on my altar to to aid the other stones in their mahi...The Tower energies holding space.
Often the first crystal people buy.  Mine found me.  My friend found in the street on the way to my house, that was 30 years ago and I still have it!  Have worked with this stone in many forms..I find it to be great for meditation.
Online it says for power and protection, maybe my friend knew this on some level.  I certainly needed at the time!
Remember YOU are the power, use your intention wisely....