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Magnetite is an ore of iron. It appears as large, oval-shaped clusters inside sedimentary layers and small clusters in metamorphic layers and igneous layers. A magnetite cluster may sometimes contain veins of native platinum, which can continue outside of the cluster itself.
In terms of metalsmithing, magnetite is identical to hematite and limonite. However, magnetite is distinguished by the extreme size of each deposit compared to the other iron ores, for sedimentary clusters anyways. While a vein might hold 100 tiles of ore, a cluster can contain around 750 -- this is offset somewhat by the 25% lower chance for a mined tile to drop an ore boulder, compared to vein stone, but the typical yield of the entire large cluster is still much higher.
In the real world
Magnetite is the most magnetic of all the naturally occurring minerals. It is often found in the form of black sand.
[INORGANIC:MAGNETITE] [USE_MATERIAL_TEMPLATE:STONE_TEMPLATE] [STATE_NAME_ADJ:ALL_SOLID:magnetite][DISPLAY_COLOR:0:7:1][TILE:'~'] [ENVIRONMENT:SEDIMENTARY:CLUSTER:100] [ENVIRONMENT:METAMORPHIC:CLUSTER_SMALL:100] [ENVIRONMENT:IGNEOUS_INTRUSIVE:CLUSTER_SMALL:100] [ENVIRONMENT:IGNEOUS_EXTRUSIVE:CLUSTER_SMALL:100] [ITEM_SYMBOL:'*'] [METAL_ORE:IRON:100] [SOLID_DENSITY:5046] [MATERIAL_VALUE:8] [IS_STONE] [MELTING_POINT:12768] [STATE_COLOR:ALL_SOLID:GRAY]
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