Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat Articles
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Modris Baum's Photo Gallery

X90-LM3Phlogopite, Willemite, Calcite, Serpentine Subgroup

Multiple photos available
Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA

Dimensions: 12 cm x 6.5 cm x 5 cm
Weight: 386 g

As a fluorescent specimen, this is a decent example of “lightning bolt” willemite in calcite. But the real interest of this specimen lies in the phlogopite, which is greatly enriched in Zn, Mn, and Ba. In fact, it isn’t really clear from the EDS scan (which see), if the mica is Mg or Zn (or perhaps even Mn) dominant, but most likely Mg > Zn > Mn > Ba, which would make it “phlogopite”. A reasonable description might be “intermediate barian phlogopite-hendricksite”. See the EDS scan for more discussion.

The “phlogopite” in the center is fairly euhedral. The large dark-brown area on the right is a rather thick stack of anhedral plates.

In addition to the “phlogopite”, willemite, and calcite, there are slickensides of “serpentine” and large blobs of an unidentified yellowish-green mineral (andradite? gahnite?)
Photo ID: 948152     Uploaded by: Modris Baum   View Count: 21   Approval status: Public galleries    Type: Photo - 4980 x 6608 pixels (32.9 Mpix)

4MW-NYNDawsonite

Multiple photos available
Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Largest Crystal Size: 20 mm

David Lehecka specimen.

The crystals span ca 20 mm and are mostly well terminated on the "bottom".

The dark gray stuff is donnayite-(Y). The donnayite crystals are well-formed, but very small and intergrown. In addition, some of the dawsonite is encrusted by tiny, water-clear, analcime crystals.
Photo ID: 947301     Uploaded by: Modris Baum   View Count: 12   Approval status: Public galleries    Type: Photo - 3860 x 3392 pixels (13.1 Mpix)

688-FUQWillemite, Calcite

Multiple photos available
Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA

Dimensions: 5 cm x 4 cm x 3 cm
Largest Crystal Size: 3.5 cm

Found on the Sterling Hill Mining Museu's Mine Run Dump ca 1994.

Flesh colored willemite fluorescing green and white calite flurescing orange-red. There is also minor black franklinite.

The specimen parted along natural "fault" lines while atempting to remove "just a bit more" of the calcite matrix. (What was I thinking??)
As I recall, neither the large 3.5 cm crystal nor the 3 cm twin were damaged by this stupidity, but the twin wound up with almost no matrix.
So the pieces have been glued back together. The "fault line", partly throght the calcite, but mostly along faces of the crystals, can be seen in some of the child photos.

Photo ID: 944367     Uploaded by: Modris Baum   View Count: 18   Approval status: Public galleries    Type: Photo - 3800 x 6688 pixels (25.4 Mpix)

9RX-EYEFluoborite, Franklinite

Multiple photos available
Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA

Field of View: 4.4 mm
Largest Crystal Size: 1.1 mm

I have posted this as a sort of appendix to a series of earlier posts showing a series of “blobs”, some starting as tephroite and others as zincite, all which apparently end up –somehow – as fluoborite and “Mineral F of Dunn” with a variable suite of other minerals. This earlier series ends with [https://www.mindat.org/photo-446523.html], which is perhaps the one most similar to the current specimen. The other members of this series can be found by following the links provided in the caption for this photograph.

The reason for posting yet another example of these “blobs” is that I now have two new EDS results (posted here as child photos). One of these is yet another confirmation that the needles are fluoborite. The other scan indicates that – surprisingly – the thin, black platy, material separating the layers of the “blob” is franklinite (with Mn) – not hetaerolite as might have been expected if this type of “layered blob” started out as zincite. This result makes the process by which these “blobs” formed even more geochemically mysterious.

This (the parent photo) shows only fluoborite needles (to 1.1 mm), separated by the thin platy franklinite layers. Note that the fluoborite needles grow preferentially more or less perpendicular to the franklinite layers. This is typical of the “layered blobs”, but not all of them follow this “rule”. Some of the child photos also show "Mineral F of Dunn".
Photo ID: 939126     Uploaded by: Modris Baum   View Count: 21   Approval status: Public galleries    Type: Photo - 3249 x 4350 pixels (14.1 Mpix)

XPW-3JWChabazite-Na

Multiple photos available
Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Field of View: 4.1 mm
Largest Crystal Size: 1.1 mm

FOV 4.1 x 6.6 mm.

Thin platy discs of chabazite-Na on a PSM c omposed of bits of "feldspar" (?) cemented by a fizzy, non-REE, carbonate (probably calcite), possibly after shortite.

Associated with Horváthite-(Y), Synchysite-(Ce) PSM Petersenite-(Ce) and siderite/rhodochrosite on microcline. Some of these minerals are shown in the related (same minID) photos.
Photo ID: 937514     Uploaded by: Modris Baum   View Count: 24   Approval status: Public galleries    Type: Photo - 2968 x 4839 pixels (14.4 Mpix)

86Q-LWYHedenbergite, Cerussite

Multiple photos available
Passaic pit, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA

Field of View: 6.3 mm

A vey peculiuar hedenbergite "layer cake" with cerussite "filling".

See the EDS scan (child "photo").

Photo ID: 937026     Uploaded by: Modris Baum   View Count: 19   Approval status: Public galleries    Type: Photo - 4586 x 3067 pixels (14.1 Mpix)

CXY-2TNCerussite

Multiple photos available
Passaic pit, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA

Field of View: 3.7 mm
Largest Crystal Size: 2.1 mm

This appears to be a cerussite twin, rather than just two cystals growing together. But I'm not sure.

Not the greatest of photos, but sufficient to show the habit - especially in stereo. See the child photo.

The black stuff is galena. It is actually silvery and highly reflective. But in trying to photograph it at the same time as the cerussite, it was all nothing: either black or a complete "blow out".
Photo ID: 935977     Uploaded by: Modris Baum   View Count: 17   Approval status: Public galleries    Type: Photo - 2700 x 3066 pixels (8.3 Mpix)

AD1-ECLCerussite

Multiple photos available
Passaic pit, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA

Dimensions: 7 cm x 4.5 cm x 3.5 cm
Field of View: 4.2 mm
Largest Crystal Size: 2.8 mm

Complex, transparent to translucent, cerussite crytsals with a greasy luster.

This specimen is very rich in cerussite (for the locality). There are several similar aggegates.

The matrix is largely altering galena.
Photo ID: 935911     Uploaded by: Modris Baum   View Count: 12   Approval status: Public galleries    Type: Photo - 3078 x 4246 pixels (13.1 Mpix)

XTY-TW7Cerussite

Multiple photos available
Passaic pit, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA

Field of View: 2.0 mm
Largest Crystal Size: 1.9 mm

FOV 2.0 x 2.8 mm.

Agrregate of doubly terminated cerussite crystals in parallel growth spanning 1.9 mm.
Photo ID: 935898     Uploaded by: Modris Baum   View Count: 17   Approval status: Public galleries    Type: Photo - 2688 x 3844 pixels (10.3 Mpix)

NCE-GR3Zincite, Willemite, Calcite, Franklinite

Multiple photos available
Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA

Dimensions: 6 cm x 4 cm x 2.5 cm

The UV photo was made in a half-darkened room - bright enough to capture some of the color of the zincite (albeit tinged blue by the UV source), yet dim enough for the willemite and calcite to "glow". The point being that the UV response of the willemite is so intense that you can almost see it under ambient lighting. T(he UV source was illuminating mostly one side of the specimen, so only the calcite on that side is "glowing").

I did not set out to make such a photo, but the result seemed interesting - to me at any rate.

It isn't obvious from this photo that the zincite is very platy. I have posted a child photo to show this aspect.
Photo ID: 934984     Uploaded by: Modris Baum   View Count: 16   Approval status: Public galleries    Type: Photo - 4080 x 6912 pixels (28.2 Mpix)
Page 1 of 273 (1 to 10 of 2730 total)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 ...

 
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: July 19, 2019 07:56:44
Go to top of page