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Sapphires are a precious gemstone, a variety of the mineral corundum, consisting of aluminum oxide (α-Al 2 O 3) with trace amounts of elements such as iron, titanium, chromium, copper, or magnesium. It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors.
The sapphire bearing Yogo dike is a dark gray to green intrusive rock known as a lamprophyre. The lamprophyre is an unusual igneous rock that contains a low content of silica. The rock has a porphyritic texture with large crystals of orthopyroxene and phlogopite set in a fine grained matrix. The phlogopite crystals have been used to determine ...
Padparadscha sapphires are rare; the rarest of all is the totally natural variety, with no sign of artificial treatment. [12] The name is derived from the Sanskrit padma ranga (padma = lotus; ranga = color), a color akin to the lotus flower (Nelumbo nucifera). [13] Among the fancy (non-blue) sapphires, natural padparadscha fetch the highest prices.
Heliophorus indicus, the Indian purple sapphire, [1] [2] is a small butterfly found in India that belongs to the lycaenids or blues family.
Nevertheless, diamonds, rubies, sapphires, and emeralds still have a reputation that exceeds those of other gemstones. [26] Rare or unusual gemstones, generally understood to include those gemstones which occur so infrequently in gem quality that they are scarcely known except to connoisseurs, include andalusite, axinite, cassiterite ...
The “incredibly rare” lump was unearthed at a 1,700-year-old bathhouse in the United Kingdom. ‘Mysterious’ purple lump found at ancient Roman ruins was once ‘worth more than gold’ Skip ...
Transparent gemstones occur in the pure spectral hues of red, orange, yellow, green, blue, violet. [25] In nature, there are rarely pure hues, so when speaking of the hue of a gemstone, we speak of primary and secondary and sometimes tertiary hues. Ruby is defined to be red. All other hues of the gem species corundum are called sapphire.
While most whirlwinds pick up dust and debris, a fire whirl is characterised by flames, ash and smoke which are whipped upwards in the rotating shaft.