beds of ore and coal that subducted and then were naturally smelted in the lava due to the reducing environment provided by the carbon-rich, graphitic feldspar. Telluric iron in Greenland is unique, in that it can be found in nearly all phases of iron-carbon alloys, and with drastically varying crystalline structures. In some rock it is found mixed with basalt as very small grains with sharp corners and irregular shapes, whereas in others the small, grain-sized droplets in the molten magma were able to coalesce into larger, pea-sized droplets that crystallized with a mostly spherical or oblong shape. Still in others the dike or extrusion may be made almost entirely out of very high-carbon cast-iron, which could more easily coalesce within the magma and flow into cracks due to its lower viscosity and melting point. This cast iron is often crusted with or contains inclusions of basalt, as it extruded out of the ground as very large, globular masses within the lava, out of which large boulders formed due to natural erosion of the surrounding basalt. Telluric iron is largely divided into two groups, depending on the carbon content. Type 1 is a cast-iron typically containing over 2.0% carbon, while type 2 ranges somewhere between wrought iron and a eutectoid steel. Both types tend to handle weathering in the elements very well, but tend to decompose and crumble very quickly in the dry, controlled atmosphere of a museum, although type 2 is far more prone to this kind of damage. Type 1 Type 1 telluric iron contains a significant amount of carbon. Type 1 is a white nickel cast-iron, containing 1.7 to 4% carbon and 0.05 to 4% nickel, which is very hard and brittle and does not respond well to cold working. The structure of type 1 consists mainly of pearlite and cementite or cohenite, with inclusions of troilite and silicate. The individual ferrite grains are typically about a millimeter in size. Although the composition of the grains may vary, even within the same grain, they are mostly composed of fairly pure nickel-ferrite. The ferrite grains are connected with cementite laminations; typically 5–25 micrometers thick; forming the pearlite. Type 1 is found as massive extrusions or very large boulders, typically ranging from a few tons to tens of tons. The metal could not be cold worked by the ancient Inuit, (the local inhabitants of Greenland), and proves extremely difficult