Feldspars

It was at this epoch that the rocks called feldspars, syenites, and porphyries appeared. ❋ Jules Verne (1866)

It is home to glasses, pyroxenes, feldspars, oxides, olivines, troilite and metals in its lunar soil, which is called regolith. ❋ Unknown (2010)

Many common minerals, including feldspars, contain aluminum, but extracting the metal from most minerals is very energy-intensive, and therefore expensive. ❋ Unknown (2008)

Of course plagioclase feldspars are also one of my favorites so I might be a little partial here. ❋ ReBecca Foster (2008)

The minerals included in this group are orthoclase, microcline, and the plagioclase feldspars. ❋ Unknown (2008)

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). ❋ Unknown (2007)

GABBRO: A black,course-grained,intrusive igneous rock,composed of calcic feldspars and pryoxene. ❋ Unknown (2007)

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! ❋ Unknown (2007)

In this rock, you get the recrystallization and foliation of quartz, feldspars, micas, and amphiboles into alternating light - and dark-colored bands. ❋ Unknown (2007)

"Well, when dilational stress levels rise, microfractures open in the diorite and release trace levels of radiogenic argon from feldspars into the atmosphere." ❋ L.A Graf (2000)

In order to keep it uniform, they mix the different feldspars together when supplying. ❋ Unknown (1993)

There are a tremendous number of different feldspars, all of which vary in the relative amounts of K2O, Na2O, CaO, MgO, ❋ Unknown (1993)

This means that directly substituting feldspars will affect the melting point of the glaze, and possibly its color response. ❋ Unknown (1993)

The potassium-containing soil minerals are micas and feldspars which dissolve slowly. ❋ Unknown (1991)

Many different types of feldspars exist, the main groups are: potash spar, soda spar and lime spar. ❋ Unknown (1990)

Once a feldspar has been shown to you, you will easily recognize feldspars on your own. nepheline syenite: Nepheline syenite resembles feldspar but contains less quartz; so its melting point is lower, and it can be used as a body flux at temperatures above 1060° C. Rocks containing nepheline occur widely. ❋ Unknown (1990)

Clay is made from crushed rocks, chiefly feldspars. ❋ Ontario. Ministry Of Education (N/A)

The minerals anorthite, albite, and orthoclase named in this figure are all feldspars; sylvite and halite are chlorides of potash and soda. ❋ Unknown (1915)

My [2nd] [greatest] fear is that I am like Feldspar. My first greatest fear is that [I am not]. ❋ Chucklesthe3rd (2015)

You [geode] loving [feldspar] jockeys could [rattle] your heads around if you wanted to feel rocks! ❋ WyattW (2018)

Craig Feldspar is a [hilarious] [character]. ❋ Daddyjenkins (2022)