perthitic

Related to perthitic: Poikilitic

perthitic

(pɜːˈθɪtɪk)

adj

(Geological Science) mineralogy relating to, consisting of, or having a similarity to perthite

References in periodicals archive ?

The perthitic potassium feldspar occurs as subhedral to euhedral twinned crystals up to 1.

Geological relationships and laser ablation ICP-MS U-Pb geochronology of the Saint George Batholith, southwestern New Brunswick, Canada: implications for its tectonomagmatic evolution

Lee MR, Parsons I (1995) Microtextural controls on weathering of perthitic alkali feldspars.

Pedological concepts to be considered in soil chronosequence studies

6%) Microcline often intergrown graphically and are sometimes perthitic with albite occurring as patchy perthite.

Geology and geochemical analysis of stream sediments and soil samples of Ijero Ekiti and its environs southwestern Nigeria

The main minerals in the sample are quartz, perthitic orthoclase, plagioclase with sericite, epidote and chlorite.

Using a titanium-in-quartz geothermometer for crystallization temperature estimation of the Palaeoproterozoic Suursaari quartz porphyry/Titaan-kvartsis geotermomeetria meetodi rakendamine paleoproterosoilise Suursaare kvartsporfuuri kristalliseerumistemperatuuride maaramisel

Pocket zones are characterized by quartz crystals, perthitic microcline, platy albite, orthoclase, biotite, lithium-iron micas and kaolinite.

Famous mineral localities: Volodarsk-Volynski Zhitomir Oblast, Ukraine

The feldspar fraction is dominantly altered orthoclase feldspar and perthitic ortho-clase feldspar with traces of microcline and plagioclase.

Coprolites, cololites, and fish fossils in the Mississippian Michigan Formation, Western Michigan

Lee MR, Parsons I (1995) Microtextural controls of weathering of perthitic alkali feldspars.

Trace element fractionation processes in resuspended mineral aerosols extracted from Australian continental surface materials

Perthitic and myrmekitic intergrowths are observed in few sections.

Petrography of sandstones of Thekopili Formation, Jaintia Hills district, Meghalaya

Its amount increases abruptly close to the contacts of the anorthosites with silicic rocks, where perthitic alkali feldspar partly replaces plagioclase.

Anorogenic magmatic rocks in the Estonian crystalline basement/Eesti kristalse aluskorra anorogeensed magmakivimid

Detailed field and petrographic studies reveal that Jura granitoids are megaporphyritic in nature containing phenocrysts of plagioclase and perthitic feldspar.

Petrography and strength analysis of Jura granitoid, Neelum Valley, Azad Jammu and Kashmir

Quartz (~ 30%) and perthitic K-feldspar (~ 60%) with subordinate albite grains is the main constituent indicating the hypersolvus character, alkali amphiboles (Table 3) in the amount of around 10 % are the only mafites, mica minerals are practically absent.

Contribution to petrology and K/Ar amphibole data for plutonic rocks of the Haggier Mts., Socotra Island, Yemen

The cavities are lined with euhedral crystals of smoky quartz, greenish perthitic orthoclase .