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1 Markets I: The Ecosystem and Exchange-Traded Marketsবাজার অনলাইন 2 Markets II: Rates, FX and Creditবাজার অনলাইন 3 Markets III: Commodities, Energy and Cryptoবাজার অনলাইন 4 Quantitative Methodsপদ্ধতি অনলাইন 5 Derivatives and Volatilityডেরিভেটিভস অনলাইন 6 Rates, Credit, XVA and Riskসুদহার, ঋণ ও ঝুঁকি অনলাইন 7 Research Craft: Predictors, Backtests, Measurement, Portfoliosগবেষণা অনলাইন 8 Strategies I: Equities and Futuresকৌশল অনলাইন 9 Strategies II: Volatility, Relative Value, Macro and the Bank Desksকৌশল অনলাইন 10 Microstructure and Executionএক্সিকিউশন অনলাইন 11 Market Making and High-Frequency Tradingমার্কেট মেকিং অনলাইন 12 Machine Learning for Marketsমেশিন লার্নিং অনলাইন 13 Low-Latency Softwareপ্রযুক্তি অনলাইন 14 Networks, Hardware and Trading Infrastructureপ্রযুক্তি অনলাইন 15 Research, Data and Risk Platformsপ্রযুক্তি অনলাইন 16 The Desk and the Firmপ্রতিষ্ঠান অনলাইন 17 The Industry: Firms, Roles and Careersক্যারিয়ার অনলাইন 18 Interviews I: Maths, Probability and Speedক্যারিয়ার অনলাইন 19 Interviews II: Markets, Trading Games and the Final Roundক্যারিয়ার অনলাইন 20 Interviews III: Codeক্যারিয়ার অনলাইন
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Earth and Space Sciences · পরিভাষা

Phenocryst; porphyritic কী?

অন্য নাম: phenocryst · porphyritic

Definition 17.3 High School Earth and Space Sciences · অধ্যায় 17 — Igneous Rocks

A phenocryst is a large crystal set in a mass of much smaller crystals or glass, the groundmass. A rock with phenocrysts is porphyritic.

From left to right: obsidian, a volcanic glass, with its curved conchoidal fracture (9.5\, cm across); a porphyritic rock, blocky plagioclase phenocrysts in a finer groundmass (9\, cm); then two thin sections between crossed polars: a granite, all grains large and interlocked — brown biotite, a brightly coloured muscovite, striped plagioclase, grey and white quartz; an andesite, phenocrysts of plagioclase and amphibole in a fine-grained groundmass. Photographs Twyla Baker, Mike Davis and Darla Sondrol, Geology Digital Image Library (CC0). From left to right: obsidian, a volcanic glass, with its curved conchoidal fracture (9.5\, cm across); a porphyritic rock, blocky plagioclase phenocrysts in a finer groundmass (9\, cm); then two thin sections between crossed polars: a granite, all grains large and interlocked — brown biotite, a brightly coloured muscovite, striped plagioclase, grey and white quartz; an andesite, phenocrysts of plagioclase and amphibole in a fine-grained groundmass. Photographs Twyla Baker, Mike Davis and Darla Sondrol, Geology Digital Image Library (CC0). From left to right: obsidian, a volcanic glass, with its curved conchoidal fracture (9.5\, cm across); a porphyritic rock, blocky plagioclase phenocrysts in a finer groundmass (9\, cm); then two thin sections between crossed polars: a granite, all grains large and interlocked — brown biotite, a brightly coloured muscovite, striped plagioclase, grey and white quartz; an andesite, phenocrysts of plagioclase and amphibole in a fine-grained groundmass. Photographs Twyla Baker, Mike Davis and Darla Sondrol, Geology Digital Image Library (CC0). From left to right: obsidian, a volcanic glass, with its curved conchoidal fracture (9.5\, cm across); a porphyritic rock, blocky plagioclase phenocrysts in a finer groundmass (9\, cm); then two thin sections between crossed polars: a granite, all grains large and interlocked — brown biotite, a brightly coloured muscovite, striped plagioclase, grey and white quartz; an andesite, phenocrysts of plagioclase and amphibole in a fine-grained groundmass. Photographs Twyla Baker, Mike Davis and Darla Sondrol, Geology Digital Image Library (CC0).
From left to right: obsidian, a volcanic glass, with its curved conchoidal fracture (9.5 cm9.5\,\mathrm{cm} across); a porphyritic rock, blocky plagioclase phenocrysts in a finer groundmass (9 cm9\,\mathrm{cm}); then two thin sections between crossed polars: a granite, all grains large and interlocked — brown biotite, a brightly coloured muscovite, striped plagioclase, grey and white quartz; an andesite, phenocrysts of plagioclase and amphibole in a fine-grained groundmass. Photographs Twyla Baker, Mike Davis and Darla Sondrol, Geology Digital Image Library (CC0).
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