Charting the Markets: Glencore Ripples are Felt Across the World

Stock markets dropped across the world on Tuesday, sending the MSCI All Country World Index to its lowest in two years. Glencore is at the epicenter of the sell-off: shares in the miner and commodity trader sank a record 29 percent in London on Monday, the latest leg of a slump that's seen 77 percent wiped from its value this year. Glencore shares did rebound as much as 10 percent on Tuesday. Asian stocks, as measured by the MSCI Asia Pacific Index, sank to a November 2012 low, led by a 4 percent decline in Japan.

Mining companies dropped for an eighth day, their longest losing stretch since early July. Glencore is the lightning rod for the ills of the industry: high levels of debt, slumping metals prices, and a Chinese economic slowdown. The Bloomberg World Mining Index, a gauge of the world's biggest miners, has fallen to an almost seven-year low. Since reaching its high for the year in May, the gauge has plummeted 41 percent.