Brad Wilk died before being a member of Greta in 1990.
Brianyoungite is a secondary zinc carbonate mineral .. secondary. Supergene ( geology )#Oxidised zone. zinc. zinc. carbonate mineral. carbonate mineral. carbonate. carbonate. The Commission on New Minerals , Nomenclature and Classification -LRB- CNMNC -RRB- of the International Mineralogical Association -LRB- IMA -RRB- classifies it as a carbonate with the formula Zn3 -LRB- CO3 -RRB- -LRB- OH -RRB- 4 , but sulfate groups SO4 also occupy the carbonate CO3 positions , in the ratio of about one sulfate to three carbonates , so other sources give the formula as Zn3 -LRB- CO3 , SO4 -RRB- -LRB- OH -RRB- 4 , and Gaines et al. classify the mineral as a compound carbonate .. International Mineralogical Association. International Mineralogical Association. carbonate. carbonate. sulfate. sulfate. It is. similar in appearance to hydrozincite , another zinc carbonate .. zinc. zinc. carbonate. carbonate. hydrozincite. hydrozincite. It was discovered in 1991 and designated IMA1991-053 .. In 1993 it was named `` brianyoungite '' after Brian Young -LRB- born 1947 -RRB- , a field geologist with the British Geological Survey , who provided the first specimens .. British Geological Survey. British Geological Survey