feldspars
91Lawsonite — is a hydrous calcium aluminium sorosilicate mineral with formula CaAl2Si2O7(OH)2·H2O. Lawsonite crystallizes in the orthorhombic system in prismatic, often tabular crystals. Crystal twinning is common. It forms transparent to translucent… …
92Chugwater Formation — (Group) Stratigraphic range: Triassic Outcrop of Chugwater Group near Thermopolis, Wyoming Type sedimentary Underlies …
93Normative mineralogy — is a geochemical calculation of the whole rock geochemistry of a rock sample that estimates the idealised mineralogy of a rock according to the principles of geochemistry. Normative mineral calculations can be achieved via either the CIPW Norm or …
94Mineral hydration — is an inorganic chemical reaction where water is added to the crystal structure of a mineral, usually creating a new mineral, usually called a hydrate. In geological terms, the process of mineral hydration is known as retrograde alteration and is …
95Larvikite — is probably a type of syenite, notable for the presence of handsome, thumbnail sized crystals of feldspar, which are multiply twinned on the micro scale and shot through with small inclusions, giving its characteristic silver blue sheen (Schiller …
96Endmember (mineralogy) — An endmember in mineralogy is a mineral that is at the extreme end of a mineral series in terms of purity. Minerals often can be described as solid solutions with varying compositions of some chemical elements, rather than as substances with an… …
97Sieve analysis — A sieve analysis is a practice or procedure used to assess the particle size distribution of a granular material. The size distribution is often of critical importance to the way the material performs in use. A sieve analysis can be performed on… …
98Continuous sub-grain rotation type dynamic recrystallization — In Metallurgy, Materials Science and Structural geology continuous sub grain rotation type dynamic recrystallization is recognized as an important mechanism for dynamic recrystallisation. It involves the rotation of initially low angle sub grain… …
99Duripan — A duripan is a diagnostic soil horizon of the USDA soil taxonomy that is cemented by illuvial silica into a subsurface hardpan. Similar to a fragipan, petrocalcic horizon and petrogypsic horizon, it is firmly cemented and restricts soil… …
100Moonstone (gemstone) — Moonstone General Category Feldspar variety Identification …
