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10 Aug-13:36:06 Re: new administrator - peter farquhar (Don Lum)
10 Aug-13:29:28 Re: collection of michael shaw (Michael Shaw)
10 Aug-13:06:56 Re: new administrator - peter farquhar (Michael Shaw)
10 Aug-12:58:24 New administrator - peter farquhar (Peter Farquhar)
10 Aug-12:08:59 Re: calcite ? (Dany Mabillard)
10 Aug-12:03:25 Re: collection from dany mabillard (Dany Mabillard)
10 Aug-11:15:56 Re: don lum collection (Don Lum)
10 Aug-08:11:33 Re: popular minerals - twinned quartz (japan law twin) from colombia (Tobi)
10 Aug-08:06:36 Re: collection from dany mabillard (Tobi)
10 Aug-08:02:04 Re: don lum collection (Tobi)
10 Aug-01:45:42 Re: about cyclic twinning - (5) (James Catmur)
10 Aug-00:30:55 Re: calcite ? (Steveb)
09 Aug-23:07:54 Re: about cyclic twinning - (5) (Don Lum)
09 Aug-22:29:05 Re: about cyclic twinning - (5) (Kevin Conroy)
09 Aug-15:30:13 Re: about cyclic twinning - (5) (Don Lum)
09 Aug-14:38:08 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
09 Aug-14:28:35 Re: about cyclic twinning - (5) (Kevin Conroy)
09 Aug-12:02:30 Re: about cyclic twinning - (5) (Bob Morgan)
09 Aug-11:36:21 Re: calcite ? (Michael Shaw)
09 Aug-11:27:41 Re: calcite ? (Vic Rzonca)
09 Aug-11:10:11 Re: help needed for chinese locations (Dany Mabillard)
09 Aug-09:47:12 Re: help needed for chinese locations (Volkmar Stingl)
09 Aug-09:33:00 Calcite ? (Dany Mabillard)
09 Aug-07:45:29 Re: help needed for chinese locations (Dany Mabillard)
08 Aug-23:25:53 Re: don lum collection (Don Lum)

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  Topic: How everyday common items got started
Tracy

Replies: 12
Views: 8117

PostForum: Off-Topic and Introductions   Posted: Mar 17, 2020 09:03   Subject: Re: How everyday common items got started
Yes, too much fluoride can cause tooth discoloration. At high enough concentrations it will damage the enamel secondary to hypomineralization. Young children are at the greatest risk.

-Tracy
  Topic: Dealing with damage
Tracy

Replies: 26
Views: 11555

PostForum: Off-Topic and Introductions   Posted: Mar 03, 2020 13:12   Subject: Re: Dealing with damage
Last time I checked, beauty was still in the eye of the beholder.

"One man's trash is another man's treasure" also comes to mind.

- Tracy
  Topic: Ethical mineral collecting
Tracy

Replies: 10
Views: 7247

PostForum: Off-Topic and Introductions   Posted: Mar 01, 2020 12:28   Subject: Re: Ethical mineral collecting

I love my children and my grandchildren and the last thing I would like for them to be is a wage-slave in a third-world mine. I have had the opportunity to travel in my youth, and I have seen many p ...
  Topic: Weird rock. Smells STRONG - need help to ID
Tracy

Replies: 17
Views: 5369

PostForum: What is it? - Where is it from?   Posted: Jan 10, 2020 08:45   Subject: Re: Weird rock. Smells STRONG - need help to ID
"Irradiation" means receipt of energy from radioactive emissions/decay. The radioactivity is inherent to the material emitting the energy, it doesn't transfer to the irradiated object. If ...
  Topic: Weird rock. Smells STRONG - need help to ID
Tracy

Replies: 17
Views: 5369

PostForum: What is it? - Where is it from?   Posted: Jan 08, 2020 15:21   Subject: Re: Weird rock. Smells STRONG - need help to ID
Thank you Pete and thank you Alfredo, and apologies to Stoned for sounding snitty. Text is often emotionless and I missed the joke.

I think for the new year/decade it's time for me to climb down o ...
  Topic: Weird rock. Smells STRONG - need help to ID
Tracy

Replies: 17
Views: 5369

PostForum: What is it? - Where is it from?   Posted: Jan 08, 2020 12:36   Subject: Re: Weird rock. Smells STRONG - need help to ID
I wouldn't handle it without a HazMat suit...

I can't tell whether you are serious or joking. I sincerely hope the latter. Again, where's the health hazard? It's a cobble that stinks like sulfur ...
  Topic: Weird rock. Smells STRONG - need help to ID
Tracy

Replies: 17
Views: 5369

PostForum: What is it? - Where is it from?   Posted: Jan 08, 2020 09:22   Subject: Re: Weird rock. Smells STRONG - need help to ID
Once you have let it air out long enough that it does not smell, it should no longer pose a health hazard.

...what type of health hazard currently exists?
  Topic: An Overview of Minerals Toxicity - (32)
Tracy

Replies: 7
Views: 9647

PostForum: Featured Columns of FMF   Posted: Jan 03, 2020 08:19   Subject: Re: An Overview of Minerals Toxicity - (32)
Nice write-up on why we shouldn't eat our specimens, crush them and snort the powder, or rub them vigorously on skin (especially injured or broken skin)...with that I'm stepping off my eternal soapbox ...
  Topic: Quartz pseudomorph after Red Spruce
Tracy

Replies: 6
Views: 2365

PostForum: What is it? - Where is it from?   Posted: Dec 02, 2019 11:20   Subject: Re: Quartz pseudomorph after Red Spruce
Hi again Roger,

As an aside, I'd be more skeptical of the tree species than of the locality. I checked with a friend of mine who confirmed that spruces were around in WA during the Miocene epoch ( ...
  Topic: Quartz pseudomorph after Red Spruce
Tracy

Replies: 6
Views: 2365

PostForum: What is it? - Where is it from?   Posted: Nov 29, 2019 16:41   Subject: Re: Quartz pseudomorph after Red Spruce
Curious. "Yakima Ridge West" is awfully precise, almost suggests that the former owner dug it up personally or knew the finder. A quick Google told me there's a peak along the ridge called ...
  Topic: Quartz pseudomorph after Red Spruce
Tracy

Replies: 6
Views: 2365

PostForum: What is it? - Where is it from?   Posted: Nov 29, 2019 16:01   Subject: Re: Quartz pseudomorph after Red Spruce
Hi Roger,

While I can say that, at a glance, it looks like Yakima Canyon (or other Washington State) wood, experience has taught me that appearance is is a highly unreliable identifier for petrifie ...
  Topic: Apatite related to the appetite of ungulates.
Tracy

Replies: 3
Views: 7247

PostForum: Minerals and Mineralogy   Posted: Nov 08, 2019 12:03   Subject: Re: Apatite related to the appetite of ungulates.
humans form bezoars too...but not ones made of apatite. :)
  Topic: Potential Toxicity of Handling Raw Malachite Specimens.
Tracy

Replies: 26
Views: 34750

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Nov 03, 2017 20:33   Subject: Re: Potential Toxicity of Handling Raw Malachite Specimens.
Is this discussion still going? I throw my hands (and my malachites) up in the air.

Good thing half my collection is quartz, nobody's screaming about silicosis from handling them. Not yet, anyway ...
  Topic: Terra Mineralia (Freiberg, Saxony, Germany)
Tracy

Replies: 65
Views: 50741

PostForum: Freiberg Museums   Posted: Oct 31, 2015 17:35   Subject: Re: Terra Mineralia (Freiberg, Saxony, Germany)
Some bonus pictures: I tried to "infect" my son with the mineral passion by taking him to this crystal paradise ... he first seemed to have fun, but became bored rather quick ... maybe too y ...
  Topic: Could Use A Second Opinion: Look At Mineral Pictures
Tracy

Replies: 11
Views: 8432

PostForum: Off-Topic and Introductions   Posted: Sep 03, 2015 20:14   Subject: Re: Could Use A Second Opinion: Look At Mineral Pictures
Hi Casimir. Catching up on things, I see that my thought was already expressed by Alfredo and Peter in an earlier post of yours. No need to pick it up again (and nice to know I'm in good company). ...
  Topic: Could Use A Second Opinion: Look At Mineral Pictures
Tracy

Replies: 11
Views: 8432

PostForum: Off-Topic and Introductions   Posted: Sep 03, 2015 07:20   Subject: Re: Could Use A Second Opinion: Look At Mineral Pictures
Without commenting on photos,"damage free" is a relative term. Completely intact all the way around, nothing showing on presentation face, main crystals intact but some nicks where it was t ...
  Topic: Potential Toxicity of Handling Raw Malachite Specimens.
Tracy

Replies: 26
Views: 34750

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Sep 02, 2015 15:21   Subject: Re: Potential Toxicity of Handling Raw Malachite Specimens.
As an environmental, health and safety expert, skilled in hazardous waste and materials, I will gladly accept any and all minerals that folks would like to divest themselves of -- the more highly crys ...
  Topic: Potential Toxicity of Handling Raw Malachite Specimens.
Tracy

Replies: 26
Views: 34750

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Sep 01, 2015 11:25   Subject: Re: Potential Toxicity of Handling Raw Malachite Specimens.
And Tracy is truly an expert in this field.

Thanks Les for the endorsement...I have to check out the commercial to which you refer. It sounds quite appropriate!
  Topic: Potential Toxicity of Handling Raw Malachite Specimens.
Tracy

Replies: 26
Views: 34750

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Sep 01, 2015 10:27   Subject: Re: Potential Toxicity of Handling Raw Malachite Specimens.
I'm not climbing back on my soapbox. :)

Joseph, happy to provide you with lots of reading material on risk assessment and occupational health/safety, since these are at the heart of threads like ...
  Topic: Chinese cinnabar
Tracy

Replies: 17
Views: 16900

PostForum: Minerals and Mineralogy   Posted: Jan 03, 2014 09:54   Subject: Re: Chinese cinnabar
That is kind of another concern, but I was wondering:

It is my understanding that many native mercury specimens from spanish mines were actually artificially produced by heating cinnabar chunks til ...
 
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