File:Rhodochrosite (Emma Vein, latest Cretaceous to early Tertiary, 62-66 Ma; Emma Mine, Butte, Montana, USA) 2.jpg
Original file (870 × 560 pixels, file size: 690 KB, MIME type: image/jpeg)
Captions
Captions
Summary
[edit]_2.jpg&action=edit§ion=1){kind=link}
| Description |
English: Rhodochrosite from Montana, USA. (2.1 centimeters across)
A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 5800 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates. The carbonate minerals all contain one or more carbonate (CO3-2) anions. Rhodochrosite is a manganese carbonate mineral, MnCO3. Most rhodochrosite is pinkish, but high-quality specimens are a gorgeous red color. Rhodochrosite has a glassy, nonmetallic luster, a white streak, rhomb-shaped crystals, and has a hardness of about 3.5 to 4. The sample seen here is from a relatively thick hydrothermal vein that intruded quartz monzonite host rocks in Butte, Montana. The country rock is called the Butte Quartz Monzonite, a Late Cretaceous-aged (76 Ma) igneous intrusion that occurs throughout the Butte area. Hydrothermal mineralization occurred during the latest Cretaceous to earliest Tertiary (~62-66 Ma). Veins are abundant in the Butte region and range from very thin veinlets to veins 20 feet wide. They are often composed of economically-significant minerals and have been targeted for mining since the 1800s. This rhodochrosite is from what is probably the most famous Butte vein - the Emma Vein. At currently existing outcrops (e.g., southern side of Platinum Street & western side of Jackson Street), the Emma Vein is 17 to 20 feet wide and dominated by quartz, iron oxide and manganese oxide. In the subsurface, the Emma Vein was reported to have chalcopyrite and sphalerite. At the eastern end of its subsurface occurrence, the Emma Vein was 100 feet wide and composed of nearly pure rhodochrosite (!). Locality: Emma Mine, town of Butte, Silver Bow County, southwestern Montana, USA Photo gallery of rhodochrosite: www.mindat.org/gallery.php?min=3406 |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/32194375225/ |
| Author | James St. John |
Licensing
[edit]_2.jpg&action=edit§ion=2){kind=link}
- 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@N05/32194375225. It was reviewed on 24 February 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:02, 24 February 2023 | | 870 × 560 (690 KB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/32194375225/ with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
_2.jpg&oldid=795587891){kind=link}