Group 9 - Silicates
ⓘ	Clinozoisite	9.BG.05a	{Ca₂}{Al₃}(Si₂O₇)(SiO₄)O(OH)
ⓘ	Prehnite	9.DP.20	Ca₂Al₂Si₃O₁₀(OH)₂
Unclassified Minerals, Rocks, etc.
ⓘ	'Chabazite'	-
ⓘ	'Heulandite subgroup'	-
ⓘ	'Stilbite subgroup'	-

List of minerals arranged by Dana 8th Edition classification

Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
ⓘ	Clinozoisite	58.2.1a.4	{Ca₂}{Al₃}(Si₂O₇)(SiO₄)O(OH)
Group 72 - PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings
ⓘ	Prehnite	72.1.3.1	Ca₂Al₂Si₃O₁₀(OH)₂
Unclassified Minerals, Mixtures, etc.
ⓘ	'Chabazite'	-
ⓘ	'Heulandite subgroup'	-
ⓘ	'Stilbite subgroup'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
H	ⓘ Clinozoisite	{Ca₂}{Al₃}(Si₂O₇)(SiO₄)O(OH)
O	Oxygen
O	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
O	ⓘ Clinozoisite	{Ca₂}{Al₃}(Si₂O₇)(SiO₄)O(OH)
Al	Aluminium
Al	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Al	ⓘ Clinozoisite	{Ca₂}{Al₃}(Si₂O₇)(SiO₄)O(OH)
Si	Silicon
Si	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Si	ⓘ Clinozoisite	{Ca₂}{Al₃}(Si₂O₇)(SiO₄)O(OH)
Ca	Calcium
Ca	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Ca	ⓘ Clinozoisite	{Ca₂}{Al₃}(Si₂O₇)(SiO₄)O(OH)

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Triassic

201.3 - 251.902 Ma

ID: 3186082

Mesozoic sedimentary rocks

Age: Triassic (201.3 - 251.902 Ma)

Comments: Taylorsville-Richmond Basins; Newark Graben System

Lithology: Shale

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Mesoproterozoic

1000 - 1600 Ma

ID: 2756146

Porphyroblastic Garnet-Biotite Gneiss

Age: Mesoproterozoic (1000 - 1600 Ma)

Description: Heterogeneous layered sequence is dominantly garnetiferous biotite gneiss and porphyroblastic gneiss, migmatitic in part, with subordinate interlayered amphibolite and amphibole gneiss (Ya), pelitic-composition gneiss, calcsilicate gneiss, biotite hornblende-quartz-plagioclase gneiss, and garnetiferous leucogneiss. These lithologies contain amphibolite-facies metamorphic mineral assemblages consistent with rock chemistry. Farrar (1984) reports relict granulite-facies assemblages in some rocks. This unit underlies a wide area that surrounds the State Farm antiform (Poland, 1976; Reilly, 1980; Farrar, 1984) and two subsidiary antiforms to the northeast; the unit includes the Maidens gneiss and portions of the Sabot amphibolite of Poland (1976), the eastern gneiss complex and Boscobel granodiorite gneiss of Bobyarchick (1976), and the Po River Metamorphic Suite of Pavlides (1980). Poland (1976) and Reilly (1980) proposed that the Maidens gneiss and Sabot amphibolite were a Late Precambrian- to Early Paleozoic-age volcanic-sedimentary cover sequence unconformably overlying the State Farm gneiss. Farrar (1984) interpreted relict granulite-facies mineral assemblages to have equilibrated during Grenville-age regional metamorphism; this contributed to his conclusion that the Sabot and Maidens, in addition to the State Farm, are Grenville or pre-Grenville in age. Porphyroblastic garnet-biotite gneiss (Ymd) is intruded by rocks of the Carboniferous-age Falmouth Intrusive Suite (Pavlides, 1980).

Comments: Eastern Piedmont Original map source: Virginia Division of Mineral Resources, 2003, Digital Representation of the 1993 Geologic Map of Virginia, Publication 174, CD ROM (ISO-9660) contains image file, expanded explanation in pdf, and ESRI shapefiles, scale 1:500,000.

Lithology: Major:{biotite gneiss}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

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