772 INDEX silicate minerals (continued) metamorphic rocks 3:397f, 3:398f, 3:399f, 3.-400/; 3:401f optical properties 3:565f sandstones 5:69 serpentine 3:566f, 3:566 structure l:360f clinopyroxenes characteristics 3:567 granites 3:235?, 3:242 kimberlites 3:254, 3:256? metamorphic facies 3:398f, 3:404 nomenclature 3:568f spectral data 1:111 f ultrahigh-pressure metamorphic rocks 5:534-535, 5:535f cordierite 3:235?, 3:240-241, 3:241f, 3:400f, 3:563 epidote mineral group cordierite 3:563 general discussion 3:563 tourmaline 3:563 feldspathoids 3:539-541 occurrences 3:541 structure general discussion 3:539 leucite 3:540, 3:540f, 3:541f nepheline 3:539, 3:S40f sodalite 3:540, 3:540f, 3:541f garnets aluminosilicates 3:562, 3:562f characteristics 3:561 geographic distribution 3:7? granites 3:235?, 3:240-241 kimberlites 3:254, 3:256?, 3:257f metamorphic facies 3:398f, 3:399f, 3:400f, 3:401 f, 3:404, 3:405 mineral analysis l:108t, 1:117f mineral deposit formation 3:496 pressure-temperature diagram 3:S62f spectral data 1:111 f staurolite 3:563 thermodynamic diagram 3:562f ultrahigh-pressure metamorphic rocks 5:534-535, 5:535f hornblende carbonatites 3:23If characteristics 3:505 chemical variations 3:505f granites 3:235?, 3:242 metamorphic rocks 3:397, 3:398f, 3:401f, 3:403 pressure-temperature diagram 3:243f micas 3:548-550 chemical composition 3:549 crystal structure l:360f, 3:549, 3.-549/J 3:S50f general discussion 3:548 granites 3:235?, 3:240-241 hydrothermal ore deposits 3:631-632 igneous rocks 3:550 layer type 1:361, l:361t metamorphic rocks 3:399f, 3:400f, 3:401f, 3:550 optical properties 3:550 paragenesis 3:550 physical properties 3:550 pressure-temperature diagram 3:243f sandstones 5:143? sedimentary rocks 3:550 vine nourishment 3:87/~, 3:88 orthopyroxenes 3:567-569 granites 3:240-241 kimberlites 3:256? metamorphic facies 3:398f, 3:399f, 3:400f, 3:404 ultrahigh-pressure metamorphic rocks 5:534-535, 5:535f pyroxenes 3:567-569 crystal structure 3:568f, 3:569f kimberlites 3:253 shock metamorphic effects 5:183t serpentine 3:566 staurolite 3:563 tourmaline 3:7?, 3:563 zeolites 3:591-600 applications 3:599 chabazite 3:593, 3:593?, 3:594f chemical composition 3:593?, 3:595, 3:595f clinoptilolite 3:591, 3:593?, 3:593-594, 3:594f crystal structure 3:591, 3:593? general discussion 3:591 glossary information 3:600 heulandite 3:593?, 3:593-594, 3:594f metamorphic facies 3:398f, 3:404, 3:405f, 3:412f natrolite 3:591-593, 3:593?, 3:594f occurrence alkaline lakes 3:596, 3:596f deep-sea sediments 3:597 fault zone alteration 3:599 general discussion 3:595 geothermal systems 3:599 granitic gneiss 3:599 hydrothermal alteration 3:591, 3:591f, 3:599, 3:631-632 lava flows 3:591f, 3:598, 3:598f metamorphic rocks 3:598 pegmatitic crystallization 3:599 pressure-temperature diagram 3:596f sandstones 3:597 sedimentary rocks 3:596 terrestrial pyroclastic deposits 3:597, 3:597f zircon 3:601-608 analyses radiometric geochronology 3:604 samples 3:605 sensitive high-resolution ion microprobe technique (SHRIMP) 3:606 thermal ionization mass spectrometry (TIMS) 3:605 zircon crystals 3:604 chemical composition 3:601, 3:602? economic aspects aeolian placers 3:603?, 3:604 beach placers 3:602, 3:603?, 3:604f, 3:605f mining 3:604, 3:607f placer classification 3:603? placer deposits 3:489-490 processing 3:604, 3:607f uses 3:604 world production 3:604, 3:606?, 3:606f fission track analysis 1:45, 1:47 gem-quality stones 3:602, 3:603f hafnium (Hf) 3:601 Narryer Gneiss Complex, Australia 3:607f, 3:607-608 occurrence aeolian placers 3:603?, 3:604 beach placers 3:602, 3:603?, 3:604/~, 3:605f general discussion 3:602 optical properties 3:602, 3:602? overgrowths 3:608, 3:608f properties 3:601, 3:60^? South-east Asia 1:196 structure 3:601, 3:601f xenotime 3:601, 3:608, 3:608f zircon crystals geographic distribution 3:7? kimberlites 3:256? magmatism time-scales 3:245,3:245f northern Cordillera 4:42 placer deposits 3:489-490 provenance studies 1:47, 1:52-53 siliceous oozes 4:642/", 5:53, 5:55/i 5:71f, 5:74f, 5:75, 5:75? silicified wood 5:61 silicoflagellates 5:75 silicoloculinids 3:45Of silicon (Si) biogenic silica chert 5:52 lacustrine deposits 4:556 as organic proxy 4:500 carbonatites 3:220? chert 5:51-62 Apex Chert, Pilbara region, Western Australia 1:291, l:292f, 3:313, 4:368-369, 4:369f Archaean 4:351 banded ironstone formations (BIFs) 5:38 classification 4:454, 5:26? composition chalcedony 5:51, 5:52f megaquartz 5:51, 5:52f microcrystalline quartz 5:51, 5:52f opal 5:51 precipitation 5:51 silica solubility 5:51 textures 5:52 eukaryotes 4:355, 4:360, 4:361f nodules 4:385 occurrence bedded cherts 5:53, 5:54f diatomaceous ooze accumulation 5:54, 5:54f