67
SiO2 — trigonal system (smoky polycrystalline aggregate)
gr 788 cm 20X11,5X5
gr 788 cm 20X11,5X5
69
Extract from the Mashamba West Mine in Kowezi (Lualaba)
gr 119 W. 5,35,3 - D. 1,6 - H. 6,3 6,3
gr 119 W. 5,35,3 - D. 1,6 - H. 6,3 6,3
70
a naturally formed crystal (2.21 ct) a heteromorphic portion of a crystal a faceted gemstone (octagonal cut)
gr 0,75
gr 0,75
71
Romania (?) (Ca,Mn)CO3 — manganese-bearing calcium carbonate, trigonal system
72
Transylvania, Romania (?) Sb2S3 — orthorhombic system (massive/compact variety)
74
Na(Fe,Mg)3Al6(BO3)3Si6O18(OH)4 (schorl-dravite/elbaite series) — cyclosilicate, trigonal system
Cm 5,5X5X4
Cm 5,5X5X4
77
Pb5(VO4)3Cl (vanadinite, hexagonal) on BaSO4 (barite, orthorhombic) — vanadate/sulfate association
W. 7 - D. 4,3 Cm
W. 7 - D. 4,3 Cm
78
KCa4Si8O20(F,OH)·8H2O (apophyllite, phyllosilicate, tetragonal system) on CaCO3 (calcite, trigonal)
gr 930 W. 15 - D. 14 cm
gr 930 W. 15 - D. 14 cm
79
(Ca,Na)(Al,Si)4O8 — plagioclase feldspar , triclinic system
82
Cu₂CO₃(OH)₂ — copper hydroxide carbonate, monoclinic system (fibrous-felt-like aggregate)
kg 3,6 W. 23 - D. 15 cm
kg 3,6 W. 23 - D. 15 cm
83
Na₃Ca(Si₃Al₃)O₁₂S (lazurite) + calcite + pyrite — metamorphic rock
gr 1,895 cm 16X3,5X13,5
gr 1,895 cm 16X3,5X13,5
87
Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 (elbaite, blue variety) — cyclosilicate, trigonal system
90
Cu₂CO₃(OH)₂ — copper hydroxide carbonate, monoclinic system (fibrous-felt-like aggregate)
gr 4,8 W. 26 - D. 18 cm
gr 4,8 W. 26 - D. 18 cm
91
Na3Ca(Si3Al3)O12S (lazurite) + calcite + pyrite — metamorphic rock, not a single mineral
kg 3,3 W. 9 - D. 11 - H. 22 Cm
kg 3,3 W. 9 - D. 11 - H. 22 Cm
92
Na₃Ca(Si₃Al₃)O₁₂S (lazurite) + calcite + pyrite — metamorphic rock
kg 2,4 cm 19X3,5X14,5
kg 2,4 cm 19X3,5X14,5
93
CaCO₃ (calcite, trigonal) on SiO₂ (chalcedony, microcrystalline) and Cu₂CO₃(OH)₂ (malachite, monoclinic)
kg 10,4 W. 41 - D. 29 cm
kg 10,4 W. 41 - D. 29 cm
94
SiO2 — trigonal system (smoky polycrystalline aggregate)
kg 4,180 cm 21X14
kg 4,180 cm 21X14
96
Na(Fe,Mg)3Al6(BO3)3Si6O18(OH)4 (schorl-dravite/elbaite series) — cyclosilicate, trigonal system
cm 22X20
cm 22X20
97
Cu₂CO₃(OH)₂ — copper hydroxide carbonate, monoclinic system (stalactitic/botroidal aggregate)
kg 5,6 W. 15 - H. 30 cm
kg 5,6 W. 15 - H. 30 cm
98
Ca2(Mg,Fe)5Si8O22(OH)2 — amphibole (tremolite–actinolite series), interlocking fibrous structure
99
SiO₂ (chalcedony/agate) — fibrous microcrystalline structure
W. 14,5 - H. 17,5 cm
W. 14,5 - H. 17,5 cm
100
SiO₂ (microcrystalline quartz/chalcedony) — radial spherulitic structure, trigonal system
103
SiO₂ (chalcedony/silicified quartz on crocidolite) — brecciated fibrous microcrystalline structure, trigonal system
104
SiO₂ (chalcedony) — microcrystalline fibrous structure, trigonal system
106
SiO₂ (amethyst variety) — trigonal system (large, cut specimen)
W. 19 cm
W. 19 cm
107
Na₃Ca(Si₃Al₃)O₁₂S (lazurite) + calcite + pyrite — metamorphic rock
109
SiO₂ (chalcedony/silicified quartz on crocidolite) — fibrous microcrystalline structure, trigonal system
110
SiO₂ (microcrystalline quartz/chalcedony) — radial spherulitic structure, trigonal system
111
SiO₂ (chalcedony/silicified quartz on crocidolite) — brecciated fibrous microcrystalline structure, trigonal system
112
SiO₂ — trigonal system (double-terminated crystal)
kg 13,9 W. 45 - D. 15 cm
kg 13,9 W. 45 - D. 15 cm
113
SiO₂ (microcrystalline quartz/chalcedony) — radial spherulitic structure, trigonal system
114
Cu₂CO₃(OH)₂ — monoclinic system
kg 12,79 W. 28 - H. 30 cm
kg 12,79 W. 28 - H. 30 cm
115
SiO₂ (amethyst variety) — trigonal system (polycrystalline aggregate)
cm 36X22X78
cm 36X22X78
117
SiO₂ (amethyst variety) — trigonal system (polycrystalline aggregate)
cm 34X31X76
cm 34X31X76
118
SiO₂ (chalcedony/silicified quartz on crocidolite) — brecciated fibrous microcrystalline structure, trigonal system
W. 40 - D. 27 cm
W. 40 - D. 27 cm
119
SiO₂ (amethyst variety) — trigonal system (polycrystalline aggregate)
cm 34X37X105
cm 34X37X105
