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A general guide for using the Forum with some rules and tips
The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
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| Search found 61 matches |
| Author | Message |
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 Topic: A potpourri of musings....barely related to minerals. |
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| Dale Hallmark Replies: 8 Views: 10999 |
 Forum: Off-Topic and Introductions Posted: Jun 13, 2019 08:31 Subject: Re: A potpourri of musings....barely related to minerals. |
| Since Mars gravity is 0.376 of earth...and if density were to be the same for dust, then a thinner atmosphere (much thinner) would still pick up a slightly larger particle size that the same flow on e ... | |
| Topic: Your very first rock? |
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| Dale Hallmark Replies: 14 Views: 29802 |
Forum: The histories behind mineral specimens Posted: Dec 08, 2018 21:37 Subject: Re: Your very first rock? |
| don't forget the dog :-)
Dale |
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| Topic: Your very first rock? |
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| Dale Hallmark Replies: 14 Views: 29802 |
Forum: The histories behind mineral specimens Posted: Dec 08, 2018 20:45 Subject: Re: Your very first rock? |
| Reiteration:
I am almost 64 years old so my first rock was a long time ago. May not remember my first rocks accurately but ...My grandmother owned a small inactive farm and I spent a lot of time th ... |
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| Topic: Question about Lapis |
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| Dale Hallmark Replies: 8 Views: 9533 |
Forum: Off-Topic and Introductions Posted: Oct 15, 2018 12:59 Subject: Re: Question about Lapis |
| I have a small sample from Afghanistan. I'm quite happy with mine although it isn't anything special. Mine has pyrite in it too.
Dale |
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| Topic: Question about Lapis |
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| Dale Hallmark Replies: 8 Views: 9533 |
Forum: Off-Topic and Introductions Posted: Oct 15, 2018 11:06 Subject: Re: Question about Lapis |
| The white could be calcite..that is pretty common with lapis.
The main source is Afghanistan and has been for about 6000 years. It can also be found in the Chile, Siberia, Angola, Argentina, Bur ... |
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| Topic: Green petrified wood WA State? |
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| Dale Hallmark Replies: 6 Views: 9314 |
Forum: Minerals and Mineralogy Posted: Jul 12, 2018 15:09 Subject: Re: green petrified wood wa state? |
| Looks like Serpentine to me...but without some testing we will never know.
Color is by far the least useful piece of information. In my opinion. Dale |
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| Topic: Carbonates form on ponds in Oman like ice |
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| Dale Hallmark Replies: 6 Views: 10832 |
Forum: Minerals and Mineralogy Posted: Apr 28, 2018 12:21 Subject: Re: Carbonates form on ponds in Oman like ice |
| I once did some work on a property (in Texas) where the owner had a windmill flowing into a cattle watering trough. He never cut the windmill off and where the water overflowed at one end was a carbon ... | |
| Topic: Concrete as a mineral |
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| Dale Hallmark Replies: 6 Views: 7548 |
Forum: Off-Topic and Introductions Posted: Jan 29, 2018 14:26 Subject: Re: Concrete as a mineral |
| I believe that is a Alkali-Aggregate Reaction (AAR).
Depending on the type of aggregate there are other reactions that can occur, In siliceous aggregates, the reactions are called "alklali si ... |
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| Topic: Wood completely Petrified in less than a year? |
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| Dale Hallmark Replies: 21 Views: 22920 |
Forum: Off-Topic and Introductions Posted: Jul 10, 2017 08:15 Subject: Re: Wood completely Petrified in less than a year? |
| Unfortunate.
In New Zealand massive Kauri wood is dug up from under farms and it is dated to 50 thousand plus years old with no sign of petrification. Makes for some very expensive conference tabl ... |
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| Topic: Wood completely Petrified in less than a year? |
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| Dale Hallmark Replies: 21 Views: 22920 |
Forum: Off-Topic and Introductions Posted: Jul 09, 2017 20:20 Subject: Re: Wood completely Petrified in less than a year? |
| In 2004, five Japanese scientists published examples of rapid petrification in Sedimentary Geology. The team of scientists, led by Hisatada Akahane, had analyzed a small lake in the explosion crater o ... | |
| Topic: Wood completely Petrified in less than a year? |
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| Dale Hallmark Replies: 21 Views: 22920 |
Forum: Off-Topic and Introductions Posted: Jul 09, 2017 18:16 Subject: Re: Wood completely Petrified in less than a year? |
| I remember a case we studied in one Geology or Hydrology class where fence posts were replaced and the old posts had been there for 20 or thirty years. The bottom part in the ground was petrified and ... | |
| Topic: Collection of Dale Hallmark |
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| Dale Hallmark Replies: 17 Views: 31190 |
Forum: Collection photos and Collector's page Posted: Jul 08, 2017 19:13 Subject: Re: Collection of Dale Hallmark |
| Got this today. It is Native Copper from Central Arizona USA. A friend who lives there sent it to me. He no longer remembers precisely where he harvested it. It weighs 95.74g.
Dale |
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| Topic: Struggling to identify the green mineral |
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| Dale Hallmark Replies: 13 Views: 15067 |
Forum: Minerals and Mineralogy Posted: Jun 24, 2017 21:27 Subject: Re: Struggling to identify the green mineral |
| Green might be Serpentine? maybe.
Dale |
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| Topic: Struggling to identify the green mineral |
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| Dale Hallmark Replies: 13 Views: 15067 |
Forum: Minerals and Mineralogy Posted: Jun 24, 2017 21:21 Subject: Re: Struggling to identify the green mineral |
| Looks like Marble to me instead of Limestone. Don't know what the Green stuff is but green is common in marbles. I don't recall seeing anything green In limestone's before but doesn't surprise me it c ... | |
| Topic: Twenty basic minerals |
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| Dale Hallmark Replies: 8 Views: 10231 |
Forum: Off-Topic and Introductions Posted: May 29, 2017 22:24 Subject: Re: Twenty basic minerals |
| I have about 125 in my have and want list. But mine is very customized to my interests. For instance I have maybe 20 different quartz's whose only difference is color. My collection is also weighted t ... | |
| Topic: Quartz and limonite from a sandstone quarry |
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| Dale Hallmark Replies: 4 Views: 10739 |
Forum: Mines and Mineral Localities Posted: Apr 26, 2017 21:47 Subject: Re: Quartz and Limonite from a sandstone quarry |
| Sandstone can have a matrix of calcite to silica. Can be very strong to friable.
The ones I am most familiar here in Texas have been fairly soft. We used some colored ones as children as a chalk subs ... |
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| Topic: Collection of Dale Hallmark |
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| Dale Hallmark Replies: 17 Views: 31190 |
Forum: Collection photos and Collector's page Posted: Apr 12, 2017 09:50 Subject: Re: Collection of Dale Hallmark |
| Silicified or agatized dolomite locally called Alibates Flint. There is an Alibates Flint National Quarry musuem not too far from here.
Used by native peoples for over 13k year. Collected this m ... |
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| Topic: Information about turquoise mineral |
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| Dale Hallmark Replies: 7 Views: 14576 |
Forum: Conserving, Preparing and Cleaning Minerals Posted: Mar 31, 2017 21:58 Subject: Re: Information about turquoise mineral |
| One of my other hobbies is coin collecting. I have seen a coin sell for $25 and three weeks later the same type coin in similar condition sell for $160.
What ANYTHING is worth is subjective and var ... |
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| Topic: Harder than diamond, softer than talc |
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| Dale Hallmark Replies: 12 Views: 14078 |
Forum: Off-Topic and Introductions Posted: Dec 18, 2016 22:33 Subject: Re: Harder than diamond, softer than talc |
| But then Buckyballs would be man made.
Dale |
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| Topic: Harder than diamond, softer than talc |
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| Dale Hallmark Replies: 12 Views: 14078 |
Forum: Off-Topic and Introductions Posted: Dec 18, 2016 19:39 Subject: Re: Harder than diamond, softer than talc |
| How technical do you want to be? Ice, technically a mineral, can be a range of hardness and can potentially be softer than 1 but it is typically listed as a hardness of 1.5.
Can't think of anything ... |
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