登录注册
Quick Links : Mindat手册The Rock H. Currier Digital LibraryMindat Newsletter [Free Download]
主页关于 MindatMindat手册Mindat的历史版权Who We Are联系我们于 Mindat.org刊登广告
捐赠给 MindatCorporate Sponsorship赞助板页已赞助的板页在 Mindat刊登 广告的广告商于 Mindat.org刊登广告
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsThe Rock H. Currier Digital LibraryGeologic Time
搜索矿物的性质搜索矿物的化学Advanced Locality Search随意显示任何一 种矿物Random Locality使用minID搜索邻近产地Search Articles搜索词汇表更多搜索选项
搜索:
矿物名称:
地区产地名称:
关键字:
 
Mindat手册添加新照片Rate Photos产区编辑报告Coordinate Completion Report添加词汇表项目
Mining Companies统计会员列表Mineral MuseumsClubs & Organizations矿物展及活动The Mindat目录表设备设置The Mineral Quiz
照片搜索Photo GalleriesSearch by Color今天最新的照片昨天最新的照片用户照片相集过去每日精选照片相集Photography

GeneralCave Photo

19th Apr 2024 22:32 UTCLalith Aditya Senthil Kumar

This picture is of stalactites and stalagmites should have the names of the rock formations in the photo. 


Best regards- Lalith

20th Apr 2024 00:02 UTCEd Clopton 🌟 Expert

The speleothems would be described primarily as draperies and flowstone; only a few actual stalactites are visible on the distant ceiling at upper center.

What startles me is that the image is labeled as a photo of hematite.  The uploader's point is that the pinkish tint of the formations is probably due to a trace of iron oxide, but to me it's a stretch to include only hematite in the title since the photo overwhelmingly features literally tons/tonnes of calcite  with surely no more than a thimble-full of hematite (and/or other iron oxides or hydroxides) in the whole photo.

20th Apr 2024 00:54 UTCWayne Corwin

When I open the photo is turned 90 degrees CCW.

22nd Apr 2024 14:08 UTCUwe Kolitsch Manager

When I open the photo is turned 90 degrees CCW.
Can confirm this. Usual fixes didn't help - now a bug report in the managers' forum.

1st May 2024 17:30 UTCUwe Kolitsch Manager

Now fixed by Jolyon.

"(...) part of the fix involved merging the tools to fix orientation and regenerate tiles.
You'll need to manually select this option on the photo edit page to fix each one."
 


20th Apr 2024 04:31 UTCAlfredo Petrov Manager

Hematite isn't even on the mineral list for that locality, so the photo won't be displayed very prominently.

20th Apr 2024 09:06 UTCDalibor Matýsek

For kinetic reasons, it is extremely unlikely that the speleothem staining component is hematite. There's something called Ostwald's step rule, which says that the phase with the lowest kinetic barrier, the highest solubility, is the first to precipitate from solutions. It then recrystallizes. For oxides or of Fe hydroxides, the most likely primary phase will most likely be ferrihydrite. The color of speleothem hematite doesn't even match.

20th Apr 2024 14:47 UTCRalph S Bottrill 🌟 Manager

Good point Dalibor, although hematite sometimes turns up in soils etc. I thought ferrihydrite was more orange, but lepidocrocite is another possibility also.

20th Apr 2024 15:24 UTCDalibor Matýsek

Ostwald's rules say nothing about what happens to the mineral afterwards, but it does say that the formation of a well-ordered, dehydrated phase directly from solution is unlikely. Ferrihydrite is taken as a fairly common precursor for hematite. Hematite in soils is of course known. I am looking at an article by my colleague J. Majzlan, who is a little interested in this.

21st Apr 2024 03:50 UTCFrank K. Mazdab 🌟 Manager

since the photo i'm looking at is rotated 90°, and so the formations are all oriented left-right instead of vertical, i think these should be called "sta-left-rites"... heh heh.

21st Apr 2024 04:26 UTCA. A. Faller

Oh, all right...
Since no one else responded---
Good one!

21st Apr 2024 22:53 UTCRalph S Bottrill 🌟 Manager

Ha Ha Frank!

22nd Apr 2024 13:33 UTCUwe Kolitsch Manager

speleothems would be described primarily as draperies and flowstone
 Fixed.
 
and/or  
Mindat Discussions Facebook Logo Instagram Logo Discord Logo
版权所有© mindat.org1993年至2024年,除了规定的地方。 Mindat.org全赖于全球数千个以上成员和支持者们的参与。
隐私政策 - 条款和条款细则 - 联络我们 - Report a bug/vulnerability Current server date and time: 2024.5.3 02:40:39
Go to top of page