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2. Phenocryst - Wikipedia

   en.wikipedia.org/wiki/Phenocryst

   This granite, from the Swiss side of the Mont Blanc massif, has large white phenocrysts of plagioclase (that have trapezoid shapes when cut through). 1 euro coin (diameter 2.3 cm) for scale. A phenocryst is an early forming, relatively large and usually conspicuous crystal distinctly larger than the grains of the rock groundmass of an igneous rock.

3. Porphyritic - Wikipedia

   en.wikipedia.org/wiki/Porphyritic

   Porphyritic texture in a granite. This is an intrusive porphyritic rock. The white, square feldspar phenocrysts are much larger than crystals in the surrounding matrix; eastern Sierra Nevada, Rock Creek Canyon, California. A porphyritic volcanic sand grain, as seen under the petrographic microscope. The large grain in the middle is of a much ...

4. Igneous textures - Wikipedia

   en.wikipedia.org/wiki/Igneous_textures

   Examples of phaneritic igneous rocks are gabbro, diorite, and granite. Porphyritic textures develop when conditions during the cooling of magma change relatively quickly. The earlier formed minerals will have formed slowly and remain as large crystals, whereas, sudden cooling causes the rapid crystallization of the remainder of the melt into a ...

5. S-type granite - Wikipedia

   en.wikipedia.org/wiki/S-type_granite

   Higher color indices correlate with higher plagioclase to alkali feldspar ratios. [7] The most common high color index mineral in an S-type granite is biotite. [1] [4] Figure 7. Cross-polarized light photomicrograph of sample CV-114 from the S-type Strathbogie Granite with quartz and feldspar displaying a granophyric texture.

6. I traveled to 50 of the top countries for tourism and ranked ...

   www.aol.com/traveled-50-top-countries-tourism...

   The city is so rich with colors, bazaars, and ornate buildings. I loved driving down the street alongside elephants, horses, and mopeds loaded with an entire band of people. ... If you go to ...

7. Porphyry (geology) - Wikipedia

   en.wikipedia.org/wiki/Porphyry_(geology)

   "Imperial Porphyry" from the Red Sea Mountains of Egypt A waterworn cobble of porphyry Rhyolite porphyry from Colorado; scale bar in lower left is 1 cm (0.39 in). Porphyry (/ ˈ p ɔːr f ə r i / POR-fə-ree) is any of various granites or igneous rocks with coarse-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate-rich, generally aphanitic matrix or groundmass.