File:Pearl from Pinctada maxima (gold-lipped pearl oyster) 1.jpg
![File:Pearl from Pinctada maxima (gold-lipped pearl oyster) 1.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Pearl_from_Pinctada_maxima_%28gold-lipped_pearl_oyster%29_1.jpg/800px-Pearl_from_Pinctada_maxima_%28gold-lipped_pearl_oyster%29_1.jpg?20230415054926)
Original file (1,632 × 1,224 pixels, file size: 876 KB, MIME type: image/jpeg)
Captions
Captions
Summary
editDescriptionPearl from Pinctada maxima (gold-lipped pearl oyster) 1.jpg |
English: (~13.5 millimeters across)
Pearls are spherical to subspherical to irregularly-shaped, biogenic concretions of slightly iridescent, nacreous aragonite (CaCO3 - calcium carbonate). Pearls are principally made by pearl oysters (Animalia, Mollusca, Bivalvia). Natural pearls are scarce. Well-formed, spherical natural pearls are rare. Fossil pearls are known, but are also scarce. "Mother of pearl" is relatively common - the same material in pearls occurs in the actual shells of some bivalves. Well-known pearl oysters include Pinctada margaritifera (the black-lipped pearl oyster), Pinctada fucata (the Japanese pearl oyster), and Pinctada maxima (the gold-lipped pearl oyster). Mother-of-pearl is well developed in shells of other species such as Pinctada imbricata (Atlantic pearl oyster), Pteria colymbus, Pteria penguin (both are winged pearl oysters), Haliotis spp. (abalones), and Atrina spp. (pen shells). Natural pearls form when foreign objects, such as sediment grains or other debris, enter a pearl oyster and get embedded in its mantle tissue. The particle is slowly coated with nacreous aragonite, which prevents the particle from causing disease or injury. The end result is a biogenic concretion called a pearl. Natural pearls show a concentric structure through the entire cross-section. Almost all commercially available pearls are semi-natural - they have been cultured. Cultured pearls have been available for many decades. A spherical bead is placed inside a pearl oyster, under its mantle tissue. The bead is slowly coated with nacreous aragonite to produce a cultured pearl, which shows concentric structure only in the outer portions of its cross-section. Marine pearls can be whitish, pinkish, yellowish, or blackish. Freshwater pearls are also known - natural examples vary from ~spherical to highly irregularly-shaped. Blister pearls are attached to the host mollusc's shell. The pearl seen here was produced by a gold-lipped pearl oyster, Pinctada maxima. This species makes white pearls. Classification: Animalia, Mollusca, Bivalvia, Pteriomorphia, Pterioida, Pteriidae See info. at: en.wikipedia.org/wiki/Pearl and en.wikipedia.org/wiki/Pinctada_maxima |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/49519524332/ |
Author | James St. John |
Licensing
edit![w:en:Creative Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/CC_some_rights_reserved.svg/90px-CC_some_rights_reserved.svg.png)
![attribution](https://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Cc-by_new_white.svg/24px-Cc-by_new_white.svg.png)
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
![]() |
This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49519524332 (archive). It was reviewed on 20 February 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
20 February 2020
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 05:49, 15 April 2023 | ![]() | 1,632 × 1,224 (876 KB) | User-duck (talk | contribs) | Cropped 17 % horizontally using CropTool with lossless mode. |
19:23, 20 February 2020 | ![]() | 1,966 × 1,224 (964 KB) | Ser Amantio di Nicolao (talk | contribs) | User created page with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
File usage on other wikis
The following other wikis use this file:
- Usage on de.wikipedia.org
- Usage on en.wikipedia.org
- Usage on en.wiktionary.org
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 | Canon |
---|---|
Camera model | Canon PowerShot D10 |
Exposure time | 1/160 sec (0.00625) |
F-number | f/3.2 |
ISO speed rating | 80 |
Date and time of data generation | 15:59, 10 February 2020 |
Lens focal length | 8.295 mm |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
|
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 16.0 (Macintosh) |
File change date and time | 23:17, 10 February 2020 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 15:59, 10 February 2020 |
Meaning of each component |
|
Image compression mode | 3 |
APEX shutter speed | 7.3125 |
APEX aperture | 3.34375 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
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 | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 18:17, 10 February 2020 |
Unique ID of original document | 186F453579795B79060D449F2581CBE9 |