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In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...
Also contains layers of the matrix that contains blue and green slate as well as a conglomerate with quartz pebbles. [ 5 ] The Catoctin Formation found under the Chilhowee Group and above the basement rock(1.2-1.0 Ga) and is around 100–400 feet in thickness.
These are sourced from the neighboring Blackstone Group and Milford Granite (which has locally unique blue quartz). The two main rock types are interbedded with chlorite phyllite, which contains minerals such as muscovite, quartz, zoisite, magnetite and chloritoid. The formation may be the same age as the Roxbury Conglomerate in the Boston ...
Many of Pennsylvania's water gaps cut through Blue Mountain including Delaware Water Gap, Lehigh Gap, Schuylkill Gap, Susquehanna Gap, and Swatara Gap. Also along the ridge, many "wind gaps" also exist. The rocks of the Blue Mountain section include mostly Silurian aged sandstone, conglomerate, siltstone, shale, and
Tudek Site, near State College in Centre County, Pennsylvania, NRHP-listed archaeological site used as a jasper stone quarry in prehistory; Thomas Marble Quarry Houses, West Whiteland, Pennsylvania, NRHP-listed, includes quarry site and the "Quarry Master's House and two worker's houses", which are all stuccoed stone structures.
The bedrock is primarily sandstone interbedded with shale, slate, quartzite, chert and limestone fragments. Blue Mountain is underlain by sandstone, with quartz-rich rock. More moderate slopes are underlain by shale. This bedrock does not provide significant ability to neutralize acidic pollution.
] Previously the best-known locality being Tvedestrand, near Arendal, in south Norway, where masses of the sunstone occur embedded in a vein of quartz running through gneiss. Other locations include near Lake Baikal in Siberia , and several United States localities—notably at Middletown Township, Delaware County, Pennsylvania ; Plush, Oregon ...
Cliff shaped by glacial movement surrounding the Mohonk Lake at Mohonk Mountain House on Shawangunk Ridge Hand sample of the Shawangunk conglomerate from Blue Mountain, near New Tripoli, Pennsylvania. The Silurian Shawangunk Formation is a mapped bedrock unit in eastern Pennsylvania, New Jersey, and New York.