The US Coast Guardâs largest patrol cutters are the 418 foot, 4,500 ton full load Bertholf Class National Security Cutters. The illustration that accompanies the story of the four new 5,000 ton cutters shows a ship, in many ways similar to the National Security Cutter. It appears there is a medium caliber gun on the bow.
Amphibolite is a rock composed mostly of amphibole minerals. Usually it's a hornblende schist like this as hornblende is the commonest amphibole.(more below). Amphibolite forms when basaltic rock is subjected to higher temperatures (550750Â°C) and slightly greater pressure range than that which yields greenschist.mphibolite is a rock composed mostly of amphibole minerals. Usually it's a hornblende schist like this as hornblende is the commonest amphibole. (more below).
Red equant grains in mica schists belong to iron-rich garnet almandine. Pyrope is a Mg-rich garnet that occurs in (originally) deep-seated rocks like peridotite, kimberlite, eclogite, or serpentinite.Spessartine, the manganese-rich variety of the pyralspite group, is common in magmatic rocks, especially pegmatite.ndradite is not usually green but demantoid is a green variety of andradite that owes its color to chromium that is partly in place of iron in the crystal lattice. Width of view is 30 mm. Beach sand from Sri Lanka that contains lots of heavy minerals like almandine (pink) and spinel (dark red). Width of view 20 mm.