File:How a Rock Is Transformed Into Treasure.jpg
Original file (3,000 × 2,556 pixels, file size: 4.2 MB, MIME type: image/jpeg)
Captions
Summary
[edit]DescriptionHow a Rock Is Transformed Into Treasure.jpg |
English: In the upper left we see a hunk of a rock. This rock is chalcedony or quartz. Such unfinished rock is called rough. In the upper right we see a finished piece called a cabochon. Cabochons, big or small, are often put into jewelry.
The rough is cut into a 1/4 inch thick piece called a slab which you see underneath the template. Some people use these to guide them to the eventual shape of a cabochon. Advanced cutters often work without templates. Steel templates offer a variety of shapes from which to choose: ovals, circles, crosses, and more. Moving the template across the slab will eventually reveal an interesting pattern to mark off with an aluminum pencil. Rock surrounding the pattern is removed with a trim saw, by cutting closely to the outside of the marked line. Cutting closely reduces the grinding required for the next step. A grinding wheel removes even more material, resulting in a flat ¼” thick stone with the desired overall shape. Cabochons are concave, flat on one side, rounded on the other. A dome must be shaped at this point. A center line is drawn across the middle of the stone. With the grinding wheel of a cabbing machine, the side of a stone is worked away until a smooth, rounded rise to the center is achieved. Polishing produces the final product seen in the upper right, a finished cabochon. The chalcedony rock at the lower left has been tumbled in a rock tumbler. Another part of lapidary. |
Date | |
Source | Own work |
Author | Thomas Farley |
Camera location | 36° 07′ 49.02″ N, 115° 19′ 25.37″ W | View this and other nearby images on: OpenStreetMap | 36.130283; -115.323714 |
---|
Photo taken by and courtesy of Thomas Farley at https://southwestrockhounding.com
Licensing
[edit]This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. | |
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse |
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 14:40, 30 April 2020 | 3,000 × 2,556 (4.2 MB) | Thomas Farley (talk | contribs) | Uploaded own work with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | Apple |
---|---|
Camera model | iPhone 6 Plus |
Exposure time | 1/15 sec (0.066666666666667) |
F-number | f/2.2 |
ISO speed rating | 64 |
Date and time of data generation | 07:33, 4 February 2018 |
Lens focal length | 4.15 mm |
Latitude | 36° 7′ 49.02″ N |
Longitude | 115° 19′ 25.37″ W |
Altitude | 875.282 meters above sea level |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop 21.1 (Macintosh) |
File change date and time | 07:24, 30 April 2020 |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 07:33, 4 February 2018 |
APEX shutter speed | 3.906891 |
APEX aperture | 2.275007 |
APEX brightness | 2.5383651738177 |
APEX exposure bias | 0 |
Metering mode | Pattern |
Flash | Flash did not fire, auto mode |
DateTimeOriginal subseconds | 077 |
DateTimeDigitized subseconds | 077 |
Color space | Uncalibrated |
Sensing method | One-chip color area sensor |
Scene type | A directly photographed image |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Focal length in 35 mm film | 29 mm |
Scene capture type | Standard |
GPS time (atomic clock) | 15:33:56.01 |
Speed unit | Kilometers per hour |
Speed of GPS receiver | 0 |
Reference for direction of image | True direction |
Direction of image | 354.6686746988 |
Reference for bearing of destination | True direction |
Bearing of destination | 354.6686746988 |
GPS date | 4 February 2018 |
Lens used | iPhone 6 Plus back camera 4.15mm f/2.2 |
Date metadata was last modified | 00:24, 30 April 2020 |
Unique ID of original document | E6BC00E9319F2CE4C830069393DB2D66 |