Agate

Agate is a unique stone that is a variety of Chalcedony. Agate is extremely beautiful and most noted for its banded and multicolored schemes.

 Agate is very strong, resists acid. Evidences are that Stone Age men used Agate more than 15,000 years ago. Agate is mined around the world including the United States. Mexico, Germany, Italy, Brazil, China, India, Africa, etc. 

Mohs scalehardness 6.5 - 7 

Agate Treatments:-
                                      Much agate is dyed to give strong and commercially acceptable colours. The material is sawn and shaped before dyeing. Immersion in a hot sugar solution followed by immersion in concentrated sulphuric acid and heating gives black; a blue colour, once called Swiss lapis, is produced by immersion in potassium ferrocyanide and subsequent warming in a solution of ferrous sulphate to give a precipitate of Berlin blue. Chromium alum or potassium dichromate may be used to give green or
bluish green, and nickel compounds give a brighter, apple green. Impregnation with iron compounds and heating may give reddish brown and red colours. Yellow to greenish yellow is obtained by heating dry agate that has been treated with concentrated hydrochloric acid. 

Significant Gem Localities:- 


                                                                          Peru->Huancavelica Department->Huancavelica Province->Ascencion District->Yauricocha Parish->Yanacodo

                     UK->Scotland->Tayside(Angus)->Montrose->Usan->Blue Hole

USA->California->Siskiyou Co.->Klamath Mts->Cinnabar Camp->Unnamed Gemstone occurrence

                                                                             USA->Utah->Juab Co.->Thomas Range->Topaz Mountain->Unnamed Agate deposit

WEIGHT PER PIECE OF AGATE
OVAL SHAPE		MARQUISE SHAPE		PEAR SHAPE		ROUND SHAPE		SQUARE SHAPE
SIZE	WEIGHT	SIZE	WEIGHT	SIZE	WEIGHT	SIZE	WEIGHT	SIZE	WEIGHT
5*3MM	0.19	5*3MM	0.15	5*3MM	0.17	3MM	0.08	3*3MM	0.09
5*4MM	0.29	6*4MM	0.31	6*4MM	0.34	4MM	0.18	4*4MM	0.22
6*4MM	0.38	7*5MM	0.53	7*5MM	0.60	5MM	0.36	5*5MM	0.44
7*5MM	0.67	8*6MM	0.85	8*5MM	0.74	6MM	0.62	6*6MM	0.76
8*6MM	1.07	9*7MM	1.28	8*6MM	0.96	7MM	0.98	7*7MM	1.20
9*7MM	1.60	10*8MM	1.83	9*6MM	1.16	8MM	1.47	8*8MM	1.79
10*8MM	2.29	11*9MM	2.52	10*7MM	1.70	9MM	1.85	10*10MM	3.50
11*9MM	3.15	12*10MM	3.36	12*10MM	3.78	10MM	2.86
12*10MM	4.20	14*10MM	4.27
14*10MM	5.34