Chrysotile from
Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA

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Predictive Mineralogy

Classification
Locality type:	Quarry
Species:	Chrysotile
Formula:	Mg₃(Si₂O₅)(OH)₄
Confirmation
Validity:	Believed Valid
Data
Mineral Data:	Click here to view Chrysotile data
Locality Data:	Click here to view Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:	46594
Long-form Identifier:	1:3:46594:2
GUID (UUID V4):	0
Nearest other occurrences of Chrysotile

5.4km (3.3 miles)	ⓘ Tschiffely (Wheatlands) Aggregate Quarry, Montgomery County, Maryland, USA
13.6km (8.5 miles)	ⓘ Jenkins Farm Prospect, Fairfax County, Virginia, USA
49.4km (30.7 miles)	ⓘ Lord Baltimore Drive Quartz occurrence area, Windsor Mill, Baltimore County, Maryland, USA
52.7km (32.7 miles)	ⓘ Delight Quarry (Soldier's Delight Quarry; Dyer Quarry), Soldiers' Delight ridge, Delight, Baltimore County, Maryland, USA
59.7km (37.1 miles)	ⓘ Bare Hills Serpentine Quarry East, Bare Hills, Baltimore County, Maryland, USA
88.8km (55.2 miles)	ⓘ Reed Mine, Jarretsville-Dublin Mining District, Harford County, Maryland, USA
References
'Serpentinite and Rodingite in the Hunting Hill Quarry, Montgomery County, Maryland', Geological Survey Bulletin 1283, p.20 "Clinochrysotile forms veins 1/8 to 2 inches thick in serpentinite the largest vein strikes N. 50° W. and dips '25° NE. The mineral is ex- tremely fine grained, pale grayish green to bluish green, massive, waxy, and has an unctuous feel it is hard and breaks with a conchoi- dal fracture. The outer surfaces or contacts of the thickest vein are mammillary or botryoidal the clinochrysotile is bordered with calcite and dolomite. According to Norman Page (oral commun., 1967), the clinochrysotile probably formed well below 100° C., perhaps below 50° C. It appears to be the last serpentine mineral formed. Hostetler erals probably are formed at temperatures below 100° C." and Christ (1968) indicated that chrysotile and other serpentine min- *Bernstein, Lawrence R. (1980) Minerals of the Washington, D.C. Area* - Issue 5 of Educational series, Maryland Geological Survey. Department of Natural Resources, Maryland Geological Survey. p.1-148.**

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Chrysotile from Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA

Chrysotile from
Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA