Kimberlite garnets rich in chromium, are generally absent from most other igneous rocks, making them particularly useful as indicators for kimberlites. These indicator minerals are generally sought in stream sediments in modern alluvial material. Their presence may indicate the presence of a kimberlite within the erosional watershed that produced the alluvium. The geochemistry of Kimberlites is defined by the following parameters: Kimberlites are the most important source of primary diamonds. Many kimberlite pipes also produce rich alluvial or eluvial diamond placer deposits. About 6,400 kimberlite pipes have been discovered in the world, of those about 900 have been classified as diamondiferous,
ARIA Award for Best Rock Album which consists of 1000 members from different areas of the music industry, and is given to a solo artist or group who is either from Australia or an Australian resident. The award for Best Rock Album has been won by Powderfinger the most time, with three wins, for: "Internationalist" (1999), "Odyssey Number Five" (2000) and "Vulture Street". In the following table, the winner is highlighted in a separate colour, and in boldface; the nominees are those that are not highlighted or in boldface. ARIA Award for Best Rock Album The ARIA Music Award for Best Rock Album, is an award