File:Graphite-pyroxene-scapolite skarn (Lead Hill Mines, Adirondack Mountains, New York State, USA) 2.jpg
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[edit]DescriptionGraphite-pyroxene-scapolite skarn (Lead Hill Mines, Adirondack Mountains, New York State, USA) 2.jpg |
English: Graphite-pyroxene-scapolite skarn from New York State, USA. (4.9 centimeters across at its widest)
This is a polymineralic, coaresely-crystalline textured, contact metamorphic rock - a skarn. It occurs in the contact zone between a limestone and a pegmatitic granite. Three minerals are present: 1) dark green-colored augite pyroxene; 2) whitish-gray colored meionite scapolite; and 3) silvery-gray graphite. Meionite scapolite is a feldspathoid mineral, Ca4Al6Si6O24CO3 - calcium aluminosilicate-carbonate. It fluoresces a dull red color under ultraviolet light (UV light; black light). Graphite is carbon (C), which is one of two widespread polymorphs of carbon (the other is diamond). This rock comes from a graphite mine in New York State - graphite occurs there are relatively rich "veins" along the contact metamorphic zone between the limestone and the granite. The graphite content of the rock shown here is too low to be a graphite ore. Graphite has a silvery-gray color and streak, a metallic luster, a greasy feel, and a hardness of 1 (it is very soft). This sample is consistent with the "pyroxene contact rock with graphite" of Alling (1917). Age: Proterozoic ? Locality: unrecorded pit/working at Chilson Hill Mines (= Lead Hill Mines), likely from the southern or southeastern sides of Lead Hill (Chilson Hill), north of Chilson Brook, ~2.75 air miles east-southeast of the town of Chilson & ~2.75 air miles west-northwest of the town of Ticonderoga, southeastern Essex County, eastern Adirondack Mountains, northeastern New York State, USA Lead Hill Mines references: Alling (1917) - Lead Hill. pp. 23-31 in The Adirondack graphite deposits. New York State Museum Bulletin 199. Lauf & Pasto (1983) - Graphite from the Lead Hill Mine, Ticonderoga, New York. Mineralogical Record 14: 25-30. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/25628064024/ |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/25628064024 (archive). It was reviewed on 2 March 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
2 March 2020
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/11 |
ISO speed rating | 80 |
Date and time of data generation | 09:56, 4 April 2016 |
Lens focal length | 11.614 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 10:03, 4 April 2016 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 09:56, 4 April 2016 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.90625 |
APEX exposure bias | −1 |
Maximum land aperture | 4 APEX (f/4) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Supported Flashpix version | 1 |
Image width | 3,036 px |
Image height | 2,164 px |
Date metadata was last modified | 06:03, 4 April 2016 |
IIM version | 2 |