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Feldspar = feldspar, felspar alternate spelling include such variants as feldspat(h), feltspat or fieldspar.
A name given to a group of minerals, usually white or flesh-red in colour, occurring in crystals or in crystalline masses. They consist of a silicate of alumina with soda, potash, lime, etc. Feldspar is an important ingredient in granite and when fully eroded, important in useful clay formation.
The word is originally from field –ie: feldspar. The corrupt spelling felspar, more common than the correct form, was introduced on the ground of a supposed derivation from fels.
Flaking = a term used to indicate minor delamination of surfaces of stone which can easily peel off in small layers.
Flankers = the two stones which adjoin the prostrate stone in a recumbent stone circle. The flankers are often the tallest stones in the circle.
Flenite = a word coined by Sir Jacob Epstein to describe a very hard stone he used for a time (presumably from flint + granite).
Flint = a hard glassy rock which flakes easily and can be worked to produce a sharp cutting edge. Flint (chert) was used in prehistoric times for the manufacture of tools and weapons such as scrapers and arrowheads. It is commonly of a steely gray colour, found in roundish nodules of varying size, usually covered with a white incrustation. In early and poetic use flint can refer to any hard stone in general. Chemically, it is one of the purest native forms of silica, and by modern mineralogists is classed among the chalcedonic varieties of that mineral.
Flint knapping = knapping is the shaping of flint through the process of lithic reduction to manufacture stone tools.
Fogou = (Cornish for cave). An artificial underground passage, usually by English and Irish prehistoric settlements and fortifications. It runs just below the surface of the ground and it is roofed with massive stone slabs. Its purpose is still unknown
Fork lift truck = is a flexible, powerful, and maneuverable machine for moving merchandise on adjustable 'forks'. The forklift has since become an indispensable piece of equipment in manufacturing and warehousing operations. An important aspect of forklift operation is that most have rear-wheel steering which increases maneuverability in tight cornering situations. This differs from a driver's traditional experience with other wheeled vehicles. Characteristic of the forklift is its instability since forklift and load must be considered a unit with a continually varying centre of gravity with every movement of the load. Forklift can be designed with specific load, depending on how the machine is counter balanced. The weight limit for the forks decreases as the fork is elevated or if the load does not butt against the fork "L".
Fracking = hydraulic fracturing involves injecting millions of gallons of water, sand, and chemicals, many of them toxic, into the earth at high pressures to break up rock formations and release natural gas trapped inside.
Freestone = 'freestone' has no bedding.
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