This is an 4.8" wide, polished section of mtorolite (chrome chalcedony) from Mtoroshanga, Zimbabwe. One side has been left rough, presenting the botryoidal formations while the opposite side has been polished to a mirror-like finish. Comes with an acrylic display stand.
Chrome chalcedony is a variety of chalcedony that gains its color from trace amounts of chromium. Depending on where it comes from, it may have different names. Specimens from Australia are called chrome chalcedony, from Zimbabwe its known as "mtorolite" and specimens from Bolivia are often referred to as "chiquitanita". Chrome chalcedony is similar to chrysoprase, however chrysoprase earns its color from trace amounts of nickel, as opposed to chrome chalcedony's chromium.