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Most of the 92 homes were built between 1923 and 1925 by Dan Montelongo, using local river stone from the Tujunga Wash. [1] The neighborhood has the highest concentration of homes utilizing native river rock as a primary building material in Los Angeles.
The California Highway Commission found the new methodology superior to the established Deval abrasion test, and adopted the LA test in 1927. [8] In the 1930s, national studies demonstrated the Deval test did not correlate with the service record of sampled rock altogether, while an LA loss rating of less than 40% was a reliable indicator of ...
Hardness may be difficult to determine, or may be misleading or meaningless, if a material is a mixture of two or more substances; for example, some sources have assigned a Mohs hardness of 6 or 7 to granite but it is a rock made of several minerals, each with its own Mohs hardness (e.g. topaz-rich granite contains: topaz — Mohs 8, quartz ...
Pages in category "Natural history of Los Angeles County, California" The following 59 pages are in this category, out of 59 total. This list may not reflect recent changes .
Location of Los Angeles County in California. This is a list of the National Register of Historic Places listings in Los Angeles County, California.. This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Los Angeles County, California, excluding the cities of Los Angeles and Pasadena.
June 11, 2009 (Along 27th Street [5: South Los Angeles: Historic district adjacent to Central Avenue Corridor in South Los Angeles; part of the African Americans in Los Angeles Multiple Property Submission (MPS)
Emery mine on Naxos Island Corundite from the Naxos emery deposits. The corundum is blue, or sapphire.Wet slab, 10 cm (3.9 in) wide. Emery, or corundite, is a dark granular rock used to make an abrasive powder.
Valleys of Los Angeles County, California (6 C, 13 P) W. Wetlands and marshes of Los Angeles County, California (14 P)