diaphaneity
41Aquamarine — Infobox mineral name = Aquamarine category = beryl variety boxwidth = boxbgcolor = imagesize = 250 caption = Aquamarine formula = Be3Al2Si6O18 molweight = color = transparent (or can be translucent if included), greenish blue to blue green,… …
42Opal — For other uses, see Opal (disambiguation). Opal An opal bracelet. The stone size is 18 by 15 mm (0.7 by 0.6 in) General Category …
43Baryte — (barite) Baryte crystals on dolomite from Cumbria, England (size: 5.4×4.6 cm) General Category Sulfate mineral, barite group …
44Celestine (mineral) — Infobox mineral name = Celestine category = boxwidth = boxbgcolor = imagesize = 225px caption = Clear grey blue celestine crystal crust from Madagascar formula = SrSO4 sometimes contains minor calcium and/or barium molweight = color = habit =… …
45Goethite — Infobox mineral name = Goethite category = boxwidth = boxbgcolor = imagesize = caption = Goethite,from Minas Gerais, Brazil formula = α IronOxygen(Hydroxide) molweight = color = Yellowish to reddish to dark brown habit = system = Orthorhombic… …
46Apatite — Not to be confused with appetite. Apatite General Category Phosphate mineral group Chemical form …
47Millerite — For the religious movement, see Millerism. For the neighborhood in Gary, see Miller Beach. Millerite Millerite needles in a quartz geode. Locality: Halls Gap, Lincoln County, Kentucky. Size: 4.0 x 3.5 x 3.0 cm …
48Pyrochlore — Infobox mineral name = Pyrochlore category = Oxide mineral boxwidth = boxbgcolor = caption = formula = (Na,Ca)2Nb2O6(OH,F) molweight = color = Brown, yellow brown, reddish brown, orange, black habit = disseminated granular subhedral system =… …
49Ilmenite — from Miask, Ilmen Mts, Chelyabinsk Oblast , Southern Urals, Urals Region, Russia. 4.5 x 4.3 x 1.5 cm General Category Oxide mineral …
50Arsenopyrite — Arsenopyrite, Panasqueira Mine, Portugal General Category Sulfide mineral …
