feldspars

• “It was at this epoch that the rocks called feldspars, syenites, and porphyries appeared.”

  Voyage au centre de la terre. English

• “It is home to glasses, pyroxenes, feldspars, oxides, olivines, troilite and metals in its lunar soil, which is called regolith.”

  Weekend SkyWatcher's Forecast: March 19-21, 2010 | Universe Today

• “The minerals included in this group are orthoclase, microcline, and the plagioclase feldspars.”

  Feldspar

• “Many common minerals, including feldspars, contain aluminum, but extracting the metal from most minerals is very energy-intensive, and therefore expensive.”

  Aluminum

• “Of course plagioclase feldspars are also one of my favorites so I might be a little partial here.”

  Archive 2008-09-01

• “In this rock, you get the recrystallization and foliation of quartz, feldspars, micas, and amphiboles into alternating light - and dark-colored bands.”

  Metamorphic rock

• “All of these rock types are light in color because of the dominance of quartz, potassium and sodium feldspars, and plagioclase feldspar minerals (Figure 1).”

  Igneous rock

• “GABBRO: A black,course-grained,intrusive igneous rock,composed of calcic feldspars and pryoxene.”

  Think Progress » Molly Ivins hospitalized in cancer battle.

• “So far she has slate, oolitic limestone, banded sandstone with calcite cement, a few feldspar crystals though ashamedly I forgotten how to tell feldspars apart with out the add of thin sections and a microscope!”

  Snell-Pym » Jean has the Geologist Blues

• “Well, when dilational stress levels rise, microfractures open in the diorite and release trace levels of radiogenic argon from feldspars into the atmosphere.”

  Simon & Schuster: Firestorm

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