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Minette (a type of lamprophyre), from Jáchymov in the Czech Republic. Lamprophyres (from Ancient Greek λαμπρός (lamprós) 'bright' and φύρω (phúrō) 'to mix') are uncommon, small-volume ultrapotassic igneous rocks primarily occurring as dikes, lopoliths, laccoliths, stocks, and small intrusions.
The Yogo dike is a narrow subvertical sheet-like igneous body. It varies from 2 to 26 feet (0.61 to 7.92 m) thick and extends for 5 miles (8.0 km), striking at an azimuth of 255°. The dike is broken into three offset en echelon segments, [31] and dates to 48.6 mya using Ar dating on phlogopite.
Sample of lamproite [1]. Lamproite is an ultrapotassic mantle-derived volcanic or subvolcanic rock.It has low CaO, Al 2 O 3, Na 2 O, high K 2 O/Al 2 O 3, a relatively high MgO content and extreme enrichment in incompatible elements.
Diabase is crushed and used as a construction aggregate for road beds, buildings, railroad beds (rail ballast), and within dams and levees. [ 20 ] [ 21 ] Diabase can be cut for use as headstones and memorials; the base of the Marine Corps War Memorial is made of black diabase "granite" (a commercial term, not actual granite).
The term "minette" came from French miners. It is a diminutive form of "la mine", and might be translated as "little mine, little colliery" or "little vein", referring to its relatively poor iron content of between 28% and 34%.
Deichstraße (lit. "dike street") is the oldest remaining street in the Altstadt of Hamburg, Germany and a popular visitor attraction in the city. Deichstraße dates back to the 14th century; it was first mentioned in 1304. [ 1 ]
The road, formally known as Senator Efrain Treñas Boulevard, was built in 2008 to help ease traffic congestion on congested General Luna Street. [4] The site was an existing dike road devoid of shade and also originally built chiefly as a flood control measure. Locals, on the other hand, used the road for recreation, such as jogging and biking.
The dike also used to be called Enkhuizerzanddijk. [3] The road that runs on the dike is the N302 [5] and is used by 8,500 vehicles per day with a speed limit of 100 km/h. The road also features a biking path alongside the N302 on the northeastern side. Marine traffic can cross the dike at either the locks or the naviduct at Enkhuizen ...