Fire Opal, or it is also known as Cantera Opal. It is the naturally occurring stone where opal is formed in rhyolite and the opal is too small to extract - similar to Boulder Opal - where the opal is tangled in a mass of the host stone. It is a blend of chunks of vanilla in a matrix of caramel and chocolate, but does not display the play of colour that opal does. Also, you don't need to mortgage your house to pay for it.
Hardness: Mohs 3-5 (quite soft). Better suited to necklaces than bracelets.
20mm x 10mm Approx. 20 on 8 inch (20.32 cm) strand. (strand)