Icelandite is a type of volcanic rock, an andesite that is enriched in iron but deficient in aluminium (< 16.5% Al2O3). Icelandites are between rhyodacite and tholeiitic basalt in composition and contain andesine, hypersthene and augite, with a silica (SiO2) content greater than 60%. With its elevated iron content and low aluminium content compared with calc-alkaline andesite, icelandite is assigned instead to the tholeiitic magma series.
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| - Islandita (es)
- Islandit (in)
- Icelandite (en)
- Icelandite (it)
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| - La islandita es una roca ígnea volcánica de composición intermedia que contiene andesina y piroxeno ya sea ortopiroxeno, clinopiroxeno o pigeonita. También puede contener olivino en la matriz. Se distingue de la andesita propiamente tal por ser más rica en hierro y más pobre en aluminio que esta. (es)
- L'Icelandite (si pronuncia aislandite) è una roccia ignea vulcanica intermedia (SiO2 > 60% in peso), affine a un'andesite ma più ricca in ferro e più povera in alluminio. La sua composizione si colloca tra quella delle riodaciti e quella dei basalti tholeiitici. Presenta tessitura afanitica ipocristallina e porfirica. (it)
- Icelandite is a type of volcanic rock, an andesite that is enriched in iron but deficient in aluminium (< 16.5% Al2O3). Icelandites are between rhyodacite and tholeiitic basalt in composition and contain andesine, hypersthene and augite, with a silica (SiO2) content greater than 60%. With its elevated iron content and low aluminium content compared with calc-alkaline andesite, icelandite is assigned instead to the tholeiitic magma series. (en)
- Islandit adalah jenis batuan vulkanik, kaya besi, miskin alumunium, dan merupakan anggota andesit. Islandit memiliki komposisi antara dan basal toleitik serta mengandung , dan augit, dengan kandungan silika (SiO2) yang lebih besar dari 60%. (in)
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| - Icelandite is a type of volcanic rock, an andesite that is enriched in iron but deficient in aluminium (< 16.5% Al2O3). Icelandites are between rhyodacite and tholeiitic basalt in composition and contain andesine, hypersthene and augite, with a silica (SiO2) content greater than 60%. The name was coined by the British geologist Ian S. E. Carmichael (who later became professor at the University of California, Berkeley) while working around 1960 on his PhD thesis at a Cenozoic volcano near the parsonage in East Iceland. For continental cogenetic series of volcanic rocks it is generally the case that the concentration of iron decreases with increasing silica content, but at Þingmúli the opposite was true, leading Carmichael to the conclusion that the iron-rich intermediate rock deserved its own name, icelandite. With its elevated iron content and low aluminium content compared with calc-alkaline andesite, icelandite is assigned instead to the tholeiitic magma series. (en)
- La islandita es una roca ígnea volcánica de composición intermedia que contiene andesina y piroxeno ya sea ortopiroxeno, clinopiroxeno o pigeonita. También puede contener olivino en la matriz. Se distingue de la andesita propiamente tal por ser más rica en hierro y más pobre en aluminio que esta. (es)
- Islandit adalah jenis batuan vulkanik, kaya besi, miskin alumunium, dan merupakan anggota andesit. Islandit memiliki komposisi antara dan basal toleitik serta mengandung , dan augit, dengan kandungan silika (SiO2) yang lebih besar dari 60%. Nama islandit diciptakan oleh ahli geologi Inggris (yang kemudian menjadi profesor di University of California, Berkeley) saat mengerjakan tesis PhD-nya pada tahun 1960-an di sebuah gunung berapi Kenozoikum Islandia timur. Untuk kelompok batuan vulkanik kogenetik benua pada umumnya konsentrasi besi menurun dan kandungan silika meningkat, tetapi pada daerah ini adalah sebaliknya Carmichael mengarah pada kesimpulan bahwa Batuan ini layak untuk diberi nama baru, yakni islandit. (in)
- L'Icelandite (si pronuncia aislandite) è una roccia ignea vulcanica intermedia (SiO2 > 60% in peso), affine a un'andesite ma più ricca in ferro e più povera in alluminio. La sua composizione si colloca tra quella delle riodaciti e quella dei basalti tholeiitici. Presenta tessitura afanitica ipocristallina e porfirica. (it)
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