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 ArticlesThe ElementsBooks & Magazines
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 CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography

Identity HelpRock Identity

26th Feb 2020 17:55 GMTStephanie Dillingham

04189400015827396898962.jpg
I've had this necklace for a while, it was a gift from my mother. I've always wondered what the stone is. I thought it was possibly hematite but it's very light and doesn't have a red streak. I also thought it may be an agate geode but I'm not sure because the crystals are very metallic.

26th Feb 2020 18:50 GMTDonald B Peck Expert

Hello Stephanie,  Does the pendant have a black streak?  If it does it might be pyrite.  I see little square crystals all over it, and pyrite is often in cubes.  The problem is that you say "it is very light" and I would not say that pyrite is light in weight.  If it is pyrite, I think it has oxidized over time to turn it gray.  It was probably bright brass yellow when it was made.

Don

26th Feb 2020 18:58 GMTStephanie Dillingham

03494200015827433881351.jpg
Yes it is very light. The back of the pendant is smooth and has gray, brown and white pigments. It appears almost like the inside of a clam shell. I've included a photo of the back of the pendant. The hardness is almost equal to that of glass. It does scratch the glass but it requires a bit of pressure. The streak is a dull grayish color.

26th Feb 2020 22:07 GMTBob Harman

I hate to say this, but I think your second picture, the smooth polished side is the FRONT of the pendant, the side to be displayed when you wear it.  

The rough side, first pictured, is the BACK of the pendent. It is hard to tell what it is, but It might be chalcedony with a bit of banding; a piece of an agate.        CHEERS.....BOB

26th Feb 2020 22:53 GMTStephanie Dillingham

Thanks for your reply. It's hard to see it in the picture but the rough side is many tiny crystal faces that sparkle like glitter in the sunlight. They're very metallic and resemble pyrite in color. Would agate form metallic crystals like this?

26th Feb 2020 22:52 GMTJosé Zendrera Expert

Couldn't it be a piece of quartz / chalcedony / chert with a thin layer of galena in one side (first photo)?

26th Feb 2020 23:53 GMTStephanie Dillingham

Is galena safe enough to be made into a pendant?

27th Feb 2020 02:13 GMTDoug Daniels

Galena COULD be made into a pendant, but really it is too soft and fragile (tends to cleave rather easily) for jewelry use.  Don't even worry about the lead content.

27th Feb 2020 12:44 GMTPeter Slootweg

The back appears to me as a piece of agate/chalcedony with some coarser quartz down left. I think the presence of sulfides is unlikely. It looks like a piece of druzy quartz with a man made metallic coating that has worn off a bit.

27th Feb 2020 14:14 GMTStephanie Dillingham

I think you're right. The side on the stone has a few quartz crystals that are their natural color. It seems to me, based on the lightness of the stone and the quartz on the side, it's a piece of chalcedony with druzy quarts crystals that have been colored metallic.
 
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 1993-2020, 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: March 30, 2020 19:06:54
Go to top of page