1) refers to the mineral, palygorskite, and should not be used in the mineralogic or geologic literature.
See Guggenheim et al. (2006) and references therein.

2) Attapulgite is a common, globally used industrial term synonymous with palygorskite; especially, where mined and processed in the Florida-Georgia region of the United States or other commercial deposits around the world (e.g., China, Spain, Senegal, India, Australia, Greece, Turkey and Ukraine).

A designated series of parameters (i.e., water-content properties) in geotechnical engineering used for identifying, describing, and classifying fine-grained soils and clays or loams used for (ceramic) coarse ware. These parameters, which originally included six “limits of consistency” (the upper limit of viscous flow, the liquid limit, the sticky limit, the cohesion limit, the plastic limit and the shrinkage limit) are now typically limited to the “liquid limit”, the “plastic limit” and, sometimes, the “shrinkage limit”. Atterberg limits are determined on the basis of mass of water per mass of the dry soil solid by specific test methods, as standardized by ASTM Standard D4318 – 05 or other standard tests, and expressed in percent.
See Mitchell (1993).
See also activity, consistency number, liquid limit, plastic limit, plasticity index, shrinkage limit

A common clinopyroxene with wide ranges of solid solutions, (Ca,Mg,Fe²⁺,Fe³⁺,Ti,Al)₂(Si,Al)₂O₆. Si may be replaced by Al (~ 2 to 10 mole %). Ti-bearing augite may develop sector zoning (or hourglass zoning). Exsolution lamellae of Ca-poor pyroxene in augite crystals are common. Augite occurs in mafic or ultramafic igneous rocks and in high-grade metamorphic rocks.
See pyroxene group for additional details.

Refers to rock constituents or minerals that have formed in place and were not transported. Such materials have formed either at the same time as the rock in which they are found or after the formation of the rock. The term is also applied to minerals that are clearly the result of new crystal growth on older crystals of the same kind, e.g., K-rich feldspar overgrowths may be referred to as authigenic overgrowths.

In a molecular dynamics simulation, the autocorrelation function is a time-dependent function calculated from the product of a quantity at a given time relative to an initial reference time. Specific autocorrelation functions are used to calculate vibrational spectra. For example, the velocity autocorrelation function is used to determine a power spectrum, and the dipole moment autocorrelation function is used to calculate the infrared spectrum.

A poorly defined material, possibly chromian illite or a mineral mixture.