| 单词 | cassiterite |
| 例句 | On the recent trip into the forest, they found a recently abandoned gold mine and the active mine harvesting cassiterite, the main ore to make tin. The Amazon’s Largest Isolated Tribe Is Dying 2023-03-25T04:00:00Z The principle tin ore is the oxide cassiterite, SnO2, and the principle lead and thallium ores are the sulfides or the products of weathering of the sulfides. Chemistry 2019-02-14T00:00:00Z Regardless of the method, searching for gold and other minerals like cassiterite and niobium is dirty, dangerous and often illegal. Brazilians toil for gold in illegal Amazon mines 2017-09-14T04:00:00Z The ore is cassiterite and this is usually found in volcanic rocks like granite. BBC's Panorama Attacks Apple Over Indonesian Tin 2014-12-19T05:00:00Z It is also rich in resources - gold, diamonds, cassiterite and coltan, used in mobile phones. Africa's Great Lakes, but bad neighbours 2013-07-31T14:19:33Z The next day, men carry bags of cassiterite, manganese and coltan - which are used in mobile telephones and computers - from the Mudere mine, near Rubaya, in eastern Democratic Republic of Congo. Africa in pictures: 24-30 May 2013 2013-05-31T18:54:45Z Eastern Congo is blessed with gold, coltan, cassiterite and other minerals. Troops Mass in Fought-Over City, Raising Fear of New Violence in Congo 2012-12-17T03:45:06Z Regardless of the method, searching for gold and other minerals like cassiterite and niobium is dirty, dangerous and often illegal. Brazilians toil for gold in illegal Amazon mines 2017-09-14T04:00:00Z Add on conflict minerals such as cassiterite, gold, wolframite, cobalt and coltan from the Congo, plus the damage from huge pits and deep tunnels. Is there an ethical laptop? 2012-10-06T23:05:26Z Conflict minerals include coltan, cassiterite, gold and wolframite, and while you may not be familiar with some of these, they are widely used in electronics. Deal Professor: Humanitarian Effort in Congo Puts Wall St. Regulator in Unintended Role 2012-08-28T21:13:30Z Miners hunt near Bangka’s surface for veins of cassiterite, a dark mineral that is the principal tin ore, and virtually all of the work is done by hand. The Deadly Tin Inside Your iPad 2012-08-23T10:00:37Z The minerals are gold, cassiterite, wolframite and columbite-tantalite, also called coltan. S.E.C. Votes to Require More Disclosure on Source of Minerals 2012-08-22T16:53:07Z Congo is rich in coltan, used in mobile phones and other consumer electronics, and cassiterite, or tin ore. Congo mine collapse kills at least 60 2012-08-16T12:48:45Z There is but one mineral mined as an ore of tin, viz., cassiterite, the oxide, which is 78 per cent tin. The Business of Mining A brief non-technical exposition of the principles involved in the profitable operation of mines 2012-02-18T03:00:17.387Z How the SEC is monitoring electronics companies use of cassiterite, columbite-tantalite and wolframite. Disruptions: Wearing Your Computer on Your Sleeve 2011-12-19T03:13:41Z Billy says he’s not sure where all of this cassiterite was unearthed. The Deadly Tin Inside Your iPad 2012-08-23T10:00:37Z The minerals in question—cassiterite, columbite-tantalite, gold and wolframite—are widely used in consumer electronics and other products, although Congo supplies no more than 20% of global demand for these raw materials. Can Annual Reports Save Lives? 2011-12-16T23:14:58Z The workers outside Huaying Trading say the sacks they are unloading contain cassiterite, an ore that yields the tin used as solder in devices such as portable phones and laptop computers. U.S. buyers shun "conflict minerals" in Congo's east 2011-10-04T09:32:23Z In addition to these minerals emery sometimes contains quartz, mica, tourmaline, cassiterite, &c. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z The granite, which is intruded through the Eocene beds, is associated with a pegmatite containing tourmaline and cassiterite. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z The Congolese government has banned mining in the region, which is rich in the coltan used in many mobile phones, the tin ore cassiterite, as well as gold. Rebels carry out rapes in Congo with impunity: U.N. 2010-09-24T12:21:00Z This applies not only to electronics companies, but to all publicly traded US firms that use gold, cassiterite, tungsten or coltan in their products. 'Conflict minerals' finance gang rape in Africa 2010-08-14T15:00:00Z A BIG "IF" Exports of cassiterite are now running at about 100 tons a month, a 90 percent fall on the volumes seen last year. U.S. buyers shun "conflict minerals" in Congo's east 2011-10-04T09:32:23Z The crystals occurred in association with topaz, fluorspar and cassiterite; but they were mostly of rather pale colour. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Columbite-tantalite, cassiterite, wolframite, gold and metals derived from them are widely used in the manufacture of cellphones, laptop computers, MP3 players, digital cameras and all sorts of other consumer electronics. Minerals Provision Becomes Part of Financial Bill 2010-05-22T00:41:00Z By the disintegration of tin-bearing rocks and vein-stones, the cassiterite passes into the beds of streams as rolled fragments and grains, or even sand, and is then known as stream tin or alluvial tin. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 "Carnegie Andrew" to "Casus Belli" It occurs in metalliferous veins, often in association with iron-pyrites, chalybite, blende, &c., and in Cornwall and Devon, where it is abundant, with cassiterite. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" Tantalite is from Finland, and it has recently been found in some abundance in the deposits of cassiterite in the tin-field of Greenbushes in the Blackwood district, Western Australia. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 6 "Cockaigne" to "Columbus, Christopher" Our new ledge is a jim-dandy; and seem' as I cheated the woman out of her cassiterite, I'm bound to make it good in yellow gold. The Trail of a Sourdough Life in Alaska With the cassiterite are often found minerals of tungsten, molybdenum, and bismuth, as well as sulphides of iron, copper, lead, and zinc, and in some cases there is evidence of a rough zonal arrangement. The Economic Aspect of Geology The usual lustre of crystals of cassiterite is remarkably splendent, even adamantine. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 "Carnegie Andrew" to "Casus Belli" What weight of tin could be obtained by the reduction of 1 ton of cassiterite? An Elementary Study of Chemistry In certain exceptional cases this may contain some unaltered cassiterite, which is easily recognised by its appearance. A Text-book of Assaying: For the Use of Those Connected with Mines. Tin comes from the ore cassiterite; zinc from sphalerite and zincblende, or blackjack. Let's Collect Rocks and Shells All these minerals are relatively insoluble and have high specific gravity, and as a consequence they are frequently accumulated in placers, along with cassiterite and other stable, heavy minerals. The Economic Aspect of Geology Among the localities yielding cassiterite may be mentioned Cornwall, Saxony, Bohemia, Brittany, Galicia in Spain; the Malay peninsula, and the islands of Banca and Billiton; New South Wales, Queensland and Tasmania. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 "Carnegie Andrew" to "Casus Belli" Sn occurs as the mineral cassiterite, tin stone, Sn02, and is found in only a few localities, as Banca, Malacca, and England. An Introduction to Chemical Science Two grams of a mixture of silica and cassiterite left, after reduction in hydrogen, 1.78 grams. A Text-book of Assaying: For the Use of Those Connected with Mines. Deposits of cassiterite under rather exceptional conditions are worked on a large scale in Bolivia; and it is notable that cassiterite is found in Liassic limestone near Campiglia Marittima in Tuscany. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 "Carnegie Andrew" to "Casus Belli" Stannite probably alters to "wood tin," a fibrous variety of cassiterite. The Economic Aspect of Geology The hardness of cassiterite is 6.5, so that it cannot be scratched with a knife, and is nearly as hard as quartz. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 "Carnegie Andrew" to "Casus Belli" The original home of cassiterite is in veins closely related to granitic rocks. The Economic Aspect of Geology The deposits of Cornwall and of Saxony show transitions from cassiterite veins close to the intrusions into lead-silver veins at a greater distance. The Economic Aspect of Geology The origin of cassiterite veins, in view of their universal association with granitic rocks, is evidently related to igneous intrusions. The Economic Aspect of Geology |
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