GIA Colored Stones Assignment 21: Tanzanite, Iolite, Chrysoberyl, and Andalusite

GIA Colored Stones Assignment 21: Tanzanite
Chrysoberyl, and Andalusite




1967 c- cCORRECT cANS✔✔Tanzanite cwas cdiscovered cin...

zoisite c- cCORRECT cANS✔✔Tanzanite cis ca ctransparent cvariety cof...

pleochroism c- cCORRECT cANS✔✔All cthe cgems cin cthis cchapter cshare cthe coptical cproperty cof c

Merelani c- cCORRECT cANS✔✔The cfirst ctanzanite cwas cdiscovered cin cNorth cTanzania cin c_____

Tiffany's c- cCORRECT cANS✔✔Who cnamed ctanzanite?

blue c- cCORRECT cANS✔✔About c5% cof cthe ctanzanite cfound cis cnaturally c_______.

orthorhombic c- cCORRECT cANS✔✔Tanzanite ccrystallizes cin cthe c___________________ ccrysta

6 cto c7 cMohs c- cCORRECT cANS✔✔Tanzanite

Tanzanite's ctoughness cis cfair cto cpoor cbecause... c- cCORRECT cANS✔✔...it chas cone cdirection co
cthermal cshock.


vanadium, cheat c- cCORRECT cANS✔✔Tanzanite cowes cits cintense cblue ccolor cto cthe cimpurity ce
c_______ ctreatment


rarely c- cCORRECT cANS✔✔Very c________ ccolor cchange ctanzanites chave cbeen cfound. c(blue-v
cincandescent clight)


valence c- cCORRECT cANS✔✔Tanzanite cturns cblue cbecause cof ca cchange cin cthe c___________
ccomponent cwhen cit cis cheated cover c1100 cdegrees cF.


50 ccts c- cCORRECT cANS✔✔About c_______ ccan cbe cretrieved cfrom ceach cton cof cTanzanite cric

tanzanite c- cCORRECT cANS✔✔When cblue csapphire cis cscarce c_____________ coffers can caltern

chrome ctanzanite c- cCORRECT cANS✔✔Green czoisite cis csometimes ccalled...