Cassiterite is composed of tin oxide which is the principal ore for tin. The truth is, it truly is often known as 'the tin stone'. As well as its important industrial use, it's got some exciting Qualities which make substantial-top quality crystals valuable gemstones. Cassiterite specimens also are highly regarded with mineral collectors.
Cassiterite is reasonably tricky, by using a rating to the Mohs scale of 6 to seven. It tends to be opaque nevertheless skinny crystals can be translucent. Its Main virtue is its a number of crystal faces and excellent luster. Lots of specimens are graded as possessing an "adamantine" (diamond-like) or submetallic luster.
With a specific gravity of 6.seven to 7.one, cassiterite is among the densest gem products identified. Through comparison, the really dense hematite has a selected gravity of about five.28, while the particular gravity of sapphire is about four.03 and that of ΦΘΗΝΟΙ ΣΤΑΥΡΟΙ ΒΑΠΤΙΣΗΣ diamond is 3.fifty three. Cassiterite also has a really substantial refractive index of one.997 to 2.098, better than zircon, sphene and demantoid garnet (though not very as superior ΣΤΑΥΡΟΙ 18Κ ΜΕ ΜΠΡΙΓΙΑΝ as diamond).
The colors of cassiterite vary from purple, wine, black and reddish-brown to yellowish-brown. The dim brown and blackish hues are probably the most regular.
Cassiterite is located in hydrothermal veins and pegmatites related ΓΥΝΑΙΚΕΙΟΙ ΣΤΑΥΡΟΙ ΜΕ ΜΠΡΙΓΙΑΝ to granite intrusions. Resulting from its longevity, It's also usually uncovered concentrated in alluvial placer deposits, sometimes in huge plenty of σταυρος με διαμαντι portions to be commercially exploitable (as in Malaysia, as an example).
Deposits of cassiterite are present in Australia, Bolivia, China, Congo, the Czech Republic, England (Cornwall), Malaysia, Mexico, Namibia, Peru, Spain plus the United states of america (California). The best cassiterite crystals have traditionally come from the Bolivian deposit with its hydrothermal veins. Some latest aspect-grade substance from China rivals the Bolivian Σταυροί με Διαμάντια cassiterite and shows strange golden hues.