emeraldcityminerals: Brass colored striated cubes of pyrite (FeS2) stuck in a matrix of quartz. From
emeraldcityminerals: Brass colored striated cubes of pyrite (FeS2) stuck in a matrix of quartz. From the Huanzala Mine, Áncash, Peru -- source link
Tumblr Blog : emeraldcityminerals.tumblr.com