Commercial quarry, Sky Blue Hill, Crestmore quarries, Crestmore, Riverside Co., California, USA

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A former limestone/marble quarry.

The typical pegmatite of the Commercial Quarry shows the usual variable grain size, ranging from relatively fine graphic granite up to large individual crystals of feldspar 15 or 20 cm diameter. The principal minerals, all of which are usually present, are quartz, microcline, and oligoclase or, less commonly, albite. At the north end, pale epidote is present, and locally also axinite, "treanorite" (allanite), prehnite, datolite, zoisite (var. thulite), colourless garnet, zircon and several zeolites. at the south end, the rather large vertical dike is characterized by 10% to 40% of andradite garnet in crystals 1 - 2 cm diameter (Am.Min.: 26: 352-381).

This quarry was cut to the 910 foot level circa 1940 to 1954.

References

Eakle, Arthur Starr (1917), Minerals associated with the crystalline limestone at Crestmore, Riverside County, California: University of California Department of Geological Sciences Bulletin: 10: 327-360; […(abstract): Geol. Zentralbl., Band 29: 514 (1923)].

Eakle, Arthur Starr (1921), Jurupaite, a new mineral: American Mineralogist: 6: 107-109.

Larsen, Esper Signius & William F. Foshag (1921), Merwinite, a new calcium magnesium orthosilicate from Crestmore, California: American Mineralogist:6: 143-148.

Eakle, Arthur Starr (1925a), Foshagite, a new silicate from Crestmore, California: American Mineralogist: 10: 97-99.

Eakle, A.S. (1927) Famous mineral localities: Crestmore, Riversdie County, California. American Mineralogist: 12: 319-321.

Vigfussen, V.A. (1931), The system CaO-SiO2-H2O, hillebrandite and foshagite: American Journal of Science, 5th series: 21: 67-78.

Larsen, Esper Signius & Kingsley C. Dunham (1933), Tilleyite, a new mineral from the contact zone at Crestmore, California: American Mineralogist: 18: 469-473.

Moehlman, Roberts Stevens & Forest A. Gonyer (1934), Monticellite from Crestmore, California: American Mineralogist: 19: 474-476.

Daly, John W. (1935), Paragenesis of mineral assemblages at Crestmore, California American Mineralogist: 20: 638-659.

Woodford, A.O., Crippen, R.A., and Garner, K.B. (1941), Section Across Commercial Quarry, Crestmore, California; American Mineralogist: 26: 352-381.

Woodford, A.O. (1943), Crestmore minerals: California Division Mines Report 39: 333-365.

Tilley, Cecil Edgar (1947), Cuspidine from dolomite contact skarns, Broadford, Skye: Mineralogical Magazine: 28: 90-95.

Murdoch, Joseph (1951a), Unit cell of hydromagnesite: (abstract): Geological Society of America Bulletin: 62: 1465.

Murdoch, Joseph (1952), Nasonite from Crestmore, California: (abstract): Geological Society of America Bulletin: 63: 1341.

Switzer, G., & Bailey, E. H. (1953), Afwillite from Crestmore, California. American Mineralogist: 38: 629-633.

Murdoch, Joseph (1954a), The unit cell of hydromagnesite: (abstract): American Mineralogist: 37: 296-297; […American Mineralogist: 39: 24-29 (1954)].

Murdoch, Joseph (1954b), Scawtite and bultfonteinite from Crestmore, California: (abstract): Geological Society of America Bulletin: 65: 1347-1348.

McConnell, James Desmond Caldwell (1955), A chemical, optical, and X-ray study of scawtite from Ballycraigy, Larne, N. Ireland: American Mineralogist: 40: 510-514.

Murdoch, Joseph (1955a), Scawtite from Crestmore, California: American Mineralogist: 40: 505-509.

Murdoch, Joseph (1955b), Bultfonteinite from Crestmore, California: American Mineralogist: 40: 900-906.

Heller, L. & H.F.W. Taylor (1956), Crystallographic data for the calcium silicates, H.M. Stationery Office, 79 pp.: 34.

Jenni, Clarence M. (1957), Crestmore and its minerals: Gems & Minerals, No. 236: 24, 25, 63-67, May, 1957, …No. 237: 38-40, June 1957; …No. 238: 34-79, July 1957; No. 239: 50, 52, 64, Aug. 1957; …No. 240: 46, 48, Sept. 1957.

Murdoch, Joseph & Duncan McConnell (1958), Crystal chemistry of scawtite: American Mineralogist: 43: 498-502.

Burnham, C. W. (1959), Contact metamorphism of magnesian limestones at Crestmore, California Geological Society of America Bulletin: 70: 879-920.

Murdoch, Joseph & Robert A. Chalmers (1960), Ettringite (“woodfordite”) from Crestmore, California: American Mineralogist: 45: 1275-1278.

Mineralogical Magazine (1962): 33: 59-64.

Murdoch, Joseph (1962), Wightmanite, a new borate mineral from Crestmore, California: American Mineralogist: 47: 718-722.

Berry, Leonard G. (1963a), The unit cell of ettringite: American Mineralogist: 48: 939.

Carpenter, A.B. (1963), Oriented Overgrowths of thaumasite on ettringite: American Mineralogist: 48: 1394-1395.

Segnit, Ralph E. & C.J. Lancucki (1963), Fluoborite from Crestmore, California: American Mineralogist: 48: 278-282.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 59, 82, 100, 115, 180, 186, 205, 266, 276, 286, 291-292, 328, 334, 364, 366.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 103, 132, 134, 145, 150, 173, 200, 204, 217, 231, 237, 265, 300, 316, 325, 356, 368, 372, 373, 382, 392, 407, 409, 440, 441, 458, 462, 477, 478, 494, 503, 515.

Forrester, Curt (2004). Large Clintonite Crystals from the Crestmore Quarry Riverside, California. Mineralogical Record, July/August, 2004.

Mineral List

Actinolite Afwillite Albite var: Andesine var: Oligoclase Allanite-(Ce) Amphibole Group var: Uralite Andradite Anglesite Anorthite var: Labradorite 'Apatite' 'Apophyllite' Aragonite Arsenopyrite Augite 'Axinite' Azurite Bayldonite ? Biotite Bornite Brucite Bultfonteinite Calcite Cerussite Chalcocite Chalcopyrite 'Chlorite Group' Chondrodite Chrysocolla Chrysotile Clinochlore Clinozoisite Clintonite 'Crestmoreite'

Cuprite Cuspidine Danburite Datolite 'Deweylite' 'Diallage' Diopside Dolomite Epidote Ettringite Fluoborite Fluorellestadite Foshagite (TL) Galena Ganomalite Gehlenite Gonnardite Graphite Greenockite Grossular var: Plazolite Gypsum var: Selenite Hematite Hillebrandite 'Hornblende' Hydromagnesite 'Hydrotroilite' Ilmenite Kaolinite ? Laumontite var: Caporcianite Limonite Löllingite

Ludwigite ? Magnesioferrite Magnesite Magnetite Malachite Manganite ? Merwinite Microcline Mimetite Minium Molybdenite Monticellite Montmorillonite Muscovite var: Sericite Nasonite Nontronite Okenite Opal var: Opal-AN Orthoclase Periclase Perovskite 'Phillipsite' Phlogopite Prehnite Pyrite Pyrrhotite Quartz var: Chalcedony Realgar Riversideite Rutile 'Scapolite'

Scawtite Schorl Sepiolite Serendibite 'Serpentine Group' Sphalerite Spinel var: Ceylonite Spurrite Stibnite 'Stilbite' Strontianite Talc ? Tennantite Tetrahedrite Thaumasite 'Thomsonite' Thorite var: Orangite Tilleyite Titanite 'Tourmaline' Vermiculite Vesuvianite var: Californite Wightmanite (TL) Wollastonite Xanthochroite Xonotlite Zircon Zoisite var: Thulite

133 entries listed. 101 valid minerals. 2 type localities (valid minerals).