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Syenite pebbles, containing fluorescent sodalite, were moved from Canada to Michigan by glaciers; [5] these glacial erratic pebbles have been given the trade name "yooperlite". [6] In other parts of the world, these types of rocks are known as sodalite-syenite and occur in Canada, India, other US states, Greenland, Malawi, and Russia. [citation ...
Natural sodalite holds primarily chloride anions in the cages, but they can be substituted by other anions such as sulfate, sulfide, hydroxide, trisulfur with other minerals in the sodalite group representing end member compositions. The sodium can be replaced by other alkali group elements, and the chloride by other halides. Many of these have ...
Olivine can be present along with apatite, and locally quartz. Larvikite is usually rich in titanium , with titanaugite and/or titanomagnetite present. Larvikite occurs in the Larvik Batholith (also called the Larvik Plutonic Complex), a suite of ten igneous plutons emplaced in the Oslo Rift (Oslo Graben) surrounded by ~1.1 billion year old ...
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Heat can either improve or spoil gemstone color or clarity. The heating process has been well known to gem miners and cutters for centuries, and in many stone types heating is a common practice. Most citrine is made by heating amethyst , and partial heating with a strong gradient results in " ametrine " – a stone partly amethyst and partly ...
Cordierite or iolite is a magnesium iron aluminium cyclosilicate. Iron is almost always present, and a solid solution exists between Mg-rich cordierite and Fe-rich sekaninaite with a series formula: (Mg,Fe) 2 Al 3 (Si 5 AlO 18) to (Fe,Mg) 2 Al 3 (Si 5 AlO 18). [3]