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23 Jun-02:55:37 Re: the mizunaka collection - quartz (Am Mizunaka)
22 Jun-23:18:14 Re: favourite quartzes? (Eck Noch)
22 Jun-16:03:24 Re: a mineralogical trip through italy by sante celiberti (Sante Celiberti)
22 Jun-09:54:22 Re: the mizunaka collection - quartz (Eck Noch)
22 Jun-06:10:26 Re: un-registering from this website (Jordi Fabre)
22 Jun-05:58:21 Un-registering from this website (Peter@vanpeborgh.Eu)
22 Jun-02:58:37 Re: the mizunaka collection - quartz (Tobi)
22 Jun-02:52:08 Re: favourite barytes? (Tobi)
21 Jun-14:26:22 Re: a mineralogical trip through italy by sante celiberti (Sante Celiberti)
20 Jun-15:26:42 Re: a mineralogical trip through italy by sante celiberti (Sante Celiberti)
20 Jun-15:18:37 Re: favourite barytes? (Bob Harman)
20 Jun-14:06:36 Re: virtual shows: what's the concept? (Cascaillou)
19 Jun-15:10:35 Re: a mineralogical trip through italy by sante celiberti (Sante Celiberti)
19 Jun-12:45:26 Re: collection of volkmar stingl (Volkmar Stingl)
18 Jun-13:54:07 Re: virtual shows: what's the concept? (Bob Harman)
18 Jun-12:05:04 Re: virtual shows: what's the concept? (James Catmur)
18 Jun-10:14:30 Re: where can i find some bio on gilbert gauthier? (Roger Warin)
18 Jun-08:55:35 Virtual shows: what's the concept? (Cascaillou)
18 Jun-06:55:44 Re: mineral spirituality? (Cascaillou)
17 Jun-22:41:26 Re: collection of volkmar stingl (Volkmar Stingl)
17 Jun-22:09:17 Re: don lum collection (Volkmar Stingl)
17 Jun-17:03:23 Re: don lum collection (Don Lum)
17 Jun-16:11:13 Re: the mizunaka collection - quartz (Am Mizunaka)
17 Jun-15:57:24 Re: where can i find some bio on gilbert gauthier? (Pub1tzu)
17 Jun-15:44:54 Re: a mineralogical trip through italy by sante celiberti (Sante Celiberti)

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  Topic: Favourite Barytes?
Bob Harman

Replies: 24
Views: 23593

PostForum: Favourite Minerals   Posted: Jun 20, 2021 15:18   Subject: Re: Favourite Barytes?
Thought I might share another of my very many Indiana barytes.

This 15 cm x 7 cm example collected 16 years ago in Monroe County has an oval 9 cm x 4.5 cm cavity.
Aesthetically placed about in th ...
  Topic: Virtual shows: what's the concept?
Bob Harman

Replies: 3
Views: 402

PostForum: Mineral Shows   Posted: Jun 18, 2021 13:54   Subject: Re: Virtual shows: what's the concept?
We all know that during this worldwide pandemic most in person events were canceled.
Of course this included virtually all mineral/fossil shows from the big international events to the small local sh ...
  Topic: A mineralogical trip through the states of USA - Indiana
Bob Harman

Replies: 125
Views: 112596

PostForum: A mineralogical trip through the states of USA   Posted: Jun 16, 2021 08:56   Subject: Re: A mineralogical trip through the states of USA - Indiana
Nice quality or interesting very large Indiana geodes are surprising uncommon, most, for some reason, having a relatively small/dingy central cavity. This example shows a relatively small cavity, but ...
  Topic: Favourite Quartzes?
Bob Harman

Replies: 56
Views: 50384

PostForum: Favourite Minerals   Posted: Jun 16, 2021 08:26   Subject: Re: Favourite Quartzes?
I decided to revive this long dormant quartz thread.

Interesting combinations of druzy quartz, variety amethyst and hematite included amethyst are rather commonly found together in examples from th ...
  Topic: An under reported consequence of climate change sea level rise.
Bob Harman

Replies: 0
Views: 260

PostForum: Off-Topic and Introductions   Posted: Jun 09, 2021 20:09   Subject: An under reported consequence of climate change sea level rise.
As a consequence of climate change, since about 1980, or the last 40 years, sea levels have risen about 2 inches. With continued climate warming, it is estimated that by 2100, or within the next 80 ...
  Topic: Mineral spirituality?
Bob Harman

Replies: 27
Views: 13116

PostForum: Minerals and Mineralogy   Posted: Jun 08, 2021 22:42   Subject: Re: Mineral spirituality?
As a retired MD pathologist, your last sentence is not true.

One of the newest therapies for metastatic (widely spread) prostate cancer involves linking a molecule of radioactive isotope of an ele ...
  Topic: Strange green & brown geode
Bob Harman

Replies: 8
Views: 665

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jun 07, 2021 00:08   Subject: Re: Strange green & brown geode
Volkmar, When you see a cat that looks like a cat, you don't have to waste your time doing genetic testing to make sure it is not a dog or bunny rabbit.

When you see quartz over malachite and it ...
  Topic: Strange green & brown geode
Bob Harman

Replies: 8
Views: 665

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jun 06, 2021 14:17   Subject: Re: Strange Green & Brown Geode
It would help to know where it is from. It looks like druzy quartz atop malachite.

Wherever the malachite lined an open cavity, it allowed a thin layer of druzy quartz crystal tips to form.
  Topic: Stay at home - Coronavirus / Covid-19
Bob Harman

Replies: 350
Views: 109399

PostForum: National Library of Spain / Biblioteca Nacional de España (BNE) and FMF   Posted: May 27, 2021 10:09   Subject: I hope that this photo brings a smile
And, finally, I hope that this photo brings a smile to some faces during these hard times.

My grandson, 18 months old, is really into rocks.....these are his formative years!

My daughter and her ...
  Topic: I thought I might show how I keep these large examples
Bob Harman

Replies: 0
Views: 345

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: May 27, 2021 09:47   Subject: I thought I might show how I keep these large examples
Two additional examples. The first can be seen to include its surrounding limestone matrix.

The very freshest finds either include the matrix or are extracted from it. This example is an interesti ...
  Topic: A mineralogical trip through the states of USA - Indiana
Bob Harman

Replies: 125
Views: 112596

PostForum: A mineralogical trip through the states of USA   Posted: May 27, 2021 09:01   Subject: Re: A mineralogical trip through the states of USA - Indiana
In 2013, while field collecting at the Indiana rte 56 road cuts in Washington County, a fellow pulled off the road near my collecting. When this happens, I get a little anxious as to what the stranger ...
  Topic: Airtight display boxes ?
Bob Harman

Replies: 14
Views: 1090

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: May 25, 2021 13:42   Subject: Re: Airtight display boxes ?
Just as simple a solution for boxes you don't want to easily open.

Review the pix of Bob Kerr's plastic boxes protecting the very hi quality crocoite specimens.

Instead of using glue, after you ...
  Topic: Airtight display boxes ?
Bob Harman

Replies: 14
Views: 1090

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: May 25, 2021 11:50   Subject: Re: Airtight display boxes ?
HI ALL! I have been following this thread and Cascaillou's other related threads here and on MinDat.

Let me be very practical about all this.

Firstly, If you are asking to protect many tho ...
  Topic: What is this?
Bob Harman

Replies: 2
Views: 549

PostForum: What is it? - Where is it from?   Posted: May 17, 2021 09:56   Subject: Re: What is this?
Welcome to the forum.

First of all your photograph is not good.......too much focusing on the muddy gravel rather than the rock in question. Always put the dry specimen in question on a plain bland ...
  Topic: Favourite Barytes?
Bob Harman

Replies: 24
Views: 23593

PostForum: Favourite Minerals   Posted: May 16, 2021 09:08   Subject: Re: Favourite Barytes?
A portion of an Indiana geode containing a nicely terminated white tipped baryte. Showing several growth phases.
  Topic: Is this still quartz??
Bob Harman

Replies: 7
Views: 897

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 16, 2021 08:44   Subject: Re: Is this still quartz??
For reference, look at this Indiana quartz geode.

The geode, long ago, weathered out of its host limestone rock. The quartz outer rind has been exposed to the elements for millennia and has become ...
  Topic: Is this still quartz??
Bob Harman

Replies: 7
Views: 897

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 16, 2021 08:19   Subject: Re: Is this still quartz??
Not at all odd, in fact very common. That is the expected look for a massive vein of quartz whose exposed surfaces and hairline cracks/crevices have been exposed to rusty iron oxides for millenn ...
  Topic: Collection of Shawn Spink
Bob Harman

Replies: 15
Views: 980

PostForum: Collection photos and Collector's page   Posted: May 13, 2021 16:49   Subject: Re: Collection of Shawn Spink
That label certainly helps. Note that it includes the specimen's locality in New Mexico.

Now it seems more legitimate, but if there is any question of all the copper minerals analysis is suggested. ...
  Topic: Collection of Shawn Spink
Bob Harman

Replies: 15
Views: 980

PostForum: Collection photos and Collector's page   Posted: May 13, 2021 15:49   Subject: Re: Collection of Shawn Spink

Mineral: Djurleite/Chalcocite
Description: Copper wood with Azurite and Malchite in sandstone.
(Chinese Formation- Triassic Period)



Nice to see a new collector on this forum. But to be per ...
  Topic: Price changes
Bob Harman

Replies: 16
Views: 2008

PostForum: Off-Topic and Introductions   Posted: Apr 25, 2021 11:51   Subject: Re: Price changes
TOM,
There were 2 (!) personally self-collected examples shown, both used only as examples.

One was from 0 cost - $2750 offered, the other was from 0 cost - $3000 offered.
In my arithme ...
 
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