ANHYDROUS SILICATES. 
175 
1011 and 1012. Carbuncles. 
1013 to 1015. Garnets, decom¬ 
posed, with Idocrase. 
Co. Donegal, Ireland. 
1016. Helvine, or Tetrahedral 
Garnet {^Silicate of Alumina, 
Glucina, Iron, and Manganese, 
with Sulphide of Manganese'). 
Breitenbrunn, Saxony. 
1017. Idocrase, or Pyramidal 
Garnet (^Silicate of Alumina and 
Lime). 
Piedmont. 
1018. Idocrase, with Garnets. 
Near Dunglow, Co. Donegal, Ire¬ 
land. 
1019. Topaz {Silicate of Alu¬ 
mina with Silico-Jluoride of 
Aluminium), crystallized with 
Quartz in Granite. 
Odontschelon, Siberia. 
1020. Topaz, fine crystal. 
Miask, Siberia. 
Presented by M. Alibert. 
1021 and 1022. Topaz, crystal¬ 
lized with Orthoclase and smoky 
Quartz, in Granite. 
Mourne Mountains, Co. Down, 
Ireland. 
1023. Topaz, in yellow crystals, 
with Quartz. 
Schneckenstein, near Auerbach, 
Saxony. 
1024. Topaz, large yellow' crys¬ 
tal. 
Brazil. 
1025. Topaz, yellow crystal 
embedded in a crystal of Quartz. 
Brazil. 
1026. Topaz, crystal. 
1027. Topaz, in crystals, some 
rolled. 
Brazil. 
1028. Topaz, in rolled crystals. 
1029. Topaz, in fragments. 
1030. Topaz, rough. 
Flinders Island, Bass Strait, Tas 
mania. 
Presented by Dr. Milligan. 
1031. Topaz, specimens show¬ 
ing its crystalline form, cleavage, | 
and cutting for purposes of jew- 
elry. 
Flinders I., Bass Strait. 
Presented by Lady Franklin. 
1032 to 1034. Topaz, cut. 
1035 and 1036. Yellow To¬ 
paz, cut. 
1037. Pink Topaz, cut. 
1038. Blue Topaz, cut. 
1039 and 1040. Pycnite, va¬ 
riety of Topaz, with Quartz and 
Mica. 
From the Tin Mine of Altenberg, 
Saxony. 
1041. Chondrodite {Silicate 
of Magnesia with Fluoride of 
Magnesium). 
Ersby, Finland. 
1042. Chondrodite, embedded 
in Caloite. 
Ersby, Pargas, Finland. 
1043* Olivine {Silicate of 
Magnesia), with mica. 
M. Somma, Vesuvius. 
1044. Olivine, embedded in 
Augitic Lava. 
Hawaii. 
1045 and 1046. Chrysolite, or 
Peridot (transparent Olivine), cut. 
1047. Intaglio in Peridot. 
Bearded head of a man, with 
inscription TAAOT. 
From the Hertz Collection. 
1048. Spinel, or Spinelle, often 
called Spinel Ruby, {Aluminate of 
Magnesia), crystallized in octohe- 
dron and rhombic dodecahedron. 
Monroe, New Jersey. 
1048a. Spinel, large octohedral 
crystal. 
Monroe. 
1049. Spinel, rough. 
Ceylon. 
1050. Spinel Rubies. 
1051. Spinel Ruby, fine colour. 
1052. Spinel Rubies, cut in 
India. 
1053 and 1054. Pleonaste, 
black variety of Spinel {Aluminate 
of Magnesia and Iron), in octohe¬ 
dral crystals. 
Monte Somma, Naples. 
