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Index

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82                                               INDEX.
PAGE.
Carat .....................................     7S
„ meaning of term ...............    78
,, value of ...........................    78
,, weight of ........................    78
Carbon, various forms of...............      9
Carbonado ................................    11
Carbuncle.................................    34
Carnelian...................................    62
„ artificial treatment of......    62
,, beryl ............................    62
,, engraved .....................    62
„ historical .....................    62
,, mode of cutting............       62
,, onyx ... .......................    62
„ various names of varieties  ' 62
,, where found.....,............    63
Cat'seye ............................. 41,  66, 67
,, ehrysoberyl ..................    44
,, meaning of term............  44, 66
„ New South Wales .........    45
,, quartz variety...............    66
,, true ..........................    44
,, value of.......................    44
„ varieties of ..................  44,67
,, where found..................  45, 67
Chalcedony ...............................    62
,, composition of............    62
,, meaning of term.........    62
Chatoyant reflection in gems .........    68
Chrysoberyl .............................    43
,, cleavage of ...............    43
,, composition of............    43
,, crystalline S3Tstem of ...    43
,, hardness of ..............     43
,, lustre of.....................    43
,, mode of cutting .........    45
' ,, specific gravity of ......    43
Chrysolite .................................    45
,, cleavage of.................    45
,, composition of .............    45
,, crystalline system of......    45
„ engraved....................    46
,, geological formation......    46
,, hardness of..................    45
,, historical ..................    46
,, lustre of .....................    45
,, mode of cutting............    46
,, N.S. Wales localities ...    46
,, specific gravity of .........    45
,, where found ...............    46
Chrysoprase .............................I    63
,, artificial ..................    63
,, colouring substance ...    63
,, composition of .........    63
„ geological formation ...    63
,, historical ................    63
,, mode of cutting.........    63
,, uses of....................    63
,, where found ............    63
Cinnamon stone.. .......................    35
Citrine—yellow quartz.................    58
Cleavage ..................................      8
,, of the diamond...............      8
Colophonite...............................    36
Common garnet...........................    37
,, opal ............................    50
PAGE.
Composition of the aquamarine ......    27
„               beryl ...............    27
,,              chrysoberyl ......    43
,,              chrysolite.........    45
,,              diamond .........    14
,,              emerald............    27
,,              garnets ............    34
,,              opal ...............    46
,,              quartz ............    56
ruby ...............    19
,,              sapphire .........    19
,,              spinel...............    31
,,               tourmaline ......    53
,,              turquois ........    51
„              zircon...............    41
,,              topaz.............    37
Crystal, meaning of team .............    56
Crystalline form, importance of......   4, 10
Cubical system, plate of ............-...    15
Cupid's arrows ...........................    55
„ nets ..............................    58
Cymophane ................................    4t
,,           meaning of term .........    44
Cornish diamonds ........................    56
Crocidolite .................................    71
,,         composition of ...........    71
,,         meaning of term .........    72
,,         where found ...............    72
Corundum........ .......................    19
,,         cleavage of..................    19
,,         composition of ............    19
,,         crystalline system of ...    19
,,         geological formation of...    20
,,         hardness of.................    19
,,         lustre of.....................    19
,, JIacon Co., North Caro­lina ........................    20
,,         size of........................    20
,,         specific gravity of.........    19
,,         varieties of..................    19
De Beer's Mine, South Africa ......    12
Diamond......... ....................... 9
,, analysis of .................    14
,, Borneo .......................    12
Brazil... .....................    12
black...........................    10
,, breaking of .................. 8
,, cinnamon .....................    11
,, cleavage of.................. 9
,, composition of............... 9
,, crystalline system of...... 9
,, cutting and polishing, ma­terials used ...............    76
,, cutting and polishing,
various operations......    76
„ geological formation ......    11
,, green...........................    11
grey ...........................    11
,, hardness of .............. ...   9,10
,, high refractive power of..    14
,, indigo .......................    11
,, lustre of .................... 9
,, manufacture of ............    79
red..............................    10
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