potassic

Kimberlite is a type of potassic volcanic rock best known for sometimes containing diamonds.

Phlogopite and/or potassic amphibole probably are typical in the sources from which many such magmas have been derived.

Significant porphyry-style mineralisation is won from highly potassic to ultrapotassic granites.

This belt has younger potassic granites and is believed to separate two distinct crustal blocks of Archaean age.

A central potassic zone of secondary biotite and orthoclase alteration is commonly associated with most of the ore.

The granitoid rocks are mainly potassic granite and were derived principally from reworked older (3.1-2.8 Ga) gneiss.

This is typically due to fluids that have lost potassium ions in potassic alteration and gained sodium ions.

The alkaline feldspar is not potassic, but generally sodic-potassic, which is characterized by interlocking perthite, called anorthoclase.

They are also generally associated only with potassic igneous rocks; S-type granite, not I-type granodiorite or diorite.

Saskatoon lies on a long belt of rich, potassic chernozem in middle-southern Saskatchewan and is found in the Aspen parkland biome.

It occurs in association with potassic feldspar, nepheline, riebeckite, arfvedsonite, aenigmatite, astrophyllite, catapleiite, eudialyte, serandite and apophyllite.

Alteration is a mixture of sodic-calcic (albite-epidote) to potassic (K-feldspar) in style, and may vary from province to province based on host rocks and mineralising processes.

The diopside, too, is poorer in Al and Cr than most lherzolite diopsides, and the amphibole replacing orthopyroxene is potassic, sodic richterite.

At the Murun massif in the Sakha Republic it is associated with aegirine, kalsilite, potassic feldspar, titanite, lamprophyllite, wadeite and tausonite.

Changbaiite can be found in kaolinite cavities and potassic granite, which can be found in Tonghua, Southeastern Kirin, China.

Conversely, these fluids may metasomatically alter a rock, introducing new Rb and Sr into the rock (generally during potassic alteration or calcic (albitisation) alteration.

S-type granites are more prone to generating late-stage fluid rich in silica, incompatible elements and halides because they are generally more potassic, oxidised and hydrous.

It also occurs in the Earth's crust, in association with clinopyroxene, plagioclase, ilmenite, cristobalite, tridymite, fayalite, fluorapatite and potassic feldspar, and forms series with pyroxmangite.

AA greenish mineral, chromian, magnesian or potassic alumosilicate (variety of the mineral illite), it was discovered by Serbian chemist Simo Lozanić who established its formula.

Potassium hydroxide is used for industrial water treatment and is the precursor of potassium carbonate, several forms of potassium phosphate, many other potassic chemicals, and soap manufacturing.

Ultimately subduction ceased, and the slab foundered into the mantle, potentially resulting in the generation of alkalic and potassic magmas within the Rae and Hearne cratons.

The geologial processes that have shaped Paraguay's bedrock and sedimentary basins are diverse including rifting, marine sedimentation, metamorphism, eruption of flood basalts and alkaline potassic volcanism.

The Creataceous volcanism did also created minor outcrops of potassic alkaline volcanics in a graben structure developed between Asunción and Villarrica and in Amambay Department.

Mantle derived xenoliths containing majorite have been reported from potassic ultramafic magmas on Malaita Island on the Ontong Java Plateau Southwest Pacific.

Rocks with high MgO, high KO and Ba, Cs, Rb etc. may be lamprophyres, kimberlites or other rare ultramafic, potassic or ultrapotassic rocks.