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accessory minerals present in relatively minor amounts include iron oxides and iron-titanium oxides, such as magnetite , ulvospinel, and ilmenite. because of the presence of such oxide minerals, basalt can acquire strong magnetic signatures as it cools, and paleomagnetic studies have made extensive use
constructed. famous columnar basalts: giant's causeway devil's postpile, california narooma basalt, narooma, new south wales, australia samson's ribs isle of staffa, inner hebrides devil's tower , wyoming submarine eruptions pillow basalts on the south pacific seafloor pillow basalts when basalt erupts underwater...
https://www.newworldencyclopedia.org/entry/Basalt