About: http://webisa.webdatacommons.org/125217431

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	If large amounts of FE3+ and FE4+ both exist in a piece you have citrine + amethyst which is called Ametrine.
http://www.w3.org/ns/prov#wasQuotedFrom	therockcrystalshop.com.au