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Author: Subject: Name that rock
Morgan
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[*] posted on 15-1-2025 at 15:25


What might these ornamental eggs be made of? Marble or some sort of silicate or mix or something else?
https://www.youtube.com/watch?v=OMM4JXUMRYY

"As types of alabaster, gypsum and calcite have similar properties, such as light color, translucence, and soft stones that can be carved and sculpted; thus the historical use and application of alabaster for the production of carved, decorative artefacts and objets d’art.[3] Calcite alabaster also is known as onyx-marble, Egyptian alabaster, and Oriental alabaster, which terms usually describe either a compact, banded travertine stone[2] or a stalagmitic limestone colored with swirling bands of cream and brown."
https://en.wikipedia.org/wiki/Alabaster


[Edited on 15-1-2025 by Morgan]
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[*] posted on 15-1-2025 at 16:19


Quote: Originally posted by Morgan  
What might these ornamental eggs be made of? Marble or some sort of silicate or mix or something else?
https://www.youtube.com/watch?v=OMM4JXUMRYY
[Edited on 15-1-2025 by Morgan]


It looks like aragonite from Pakistan, aragonite is chemically CaCO3, similar to marble, but probably the essence of the phenomenon is in the exact shape that was cut from this aragonite...It is flowed by warm air and perhaps acts similar to an airplane wing to create movement...

[Edited on 16-1-2025 by Admagistr]
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Morgan
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[*] posted on 15-1-2025 at 18:01


That could be where the marble eggs came from. When I was about 8 years old I lived on a USAF spy base where my parents might have bought them. I've also tried using "Himalayan rock salt" from Pakistan which responds quite well as described here in PHILOSOPHICAL TRANSACTIONS by John Tyndall.

"Rock-salt.—1The rocker used in the foregoing experiment was laid aside and a piece of rock-salt was prepared for trial. The mass was cloven so as to exhibit the surfaces of the primitive cube; and was so placed that the straight line formed by the intersection of two of the surfaces of the cube was horizontal. Previous to heating the rocker, I laid it, according to practice, upon the mass, merely to ascertain whether the arrangement was likely to answer. To my astonishment a deep musical sound commenced immediately. The temperature of the rocker was at this time far below that of boiling water, and when it had ended its song it was scarcely above a blood heat."
"The heated rocker was laid upon a large boulder-shaped mass of the salt; it commenced to sing immediately. I scarcely know a substance, metallic or non-metallic, with which vibrations can be obtained with greater ease and certainty than with this mineral. To the remarkable properties which the researches of Melloni have shown to belong to rock-salt a new one may now be added."

My experiments are kind of humdrum but if interested in the topic, you can read about the effect and later other minerals tried starting on page 7.

On the Vibrations and Tones produced by the Contact of Bodies having different
Temperatures.
https://royalsocietypublishing.org/doi/pdf/10.1098/rstl.1854...
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[*] posted on 15-1-2025 at 18:35


That's interesting Morgan! I didn't know about this research...
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[*] posted on 27-1-2025 at 19:42


An agate type rock of some sort I felt needed an eye. It's about 11 cm thick in spots and weighs perhaps 6 kilograms or so. Not all that colorful but some closeup regions have a few interesting patterns.

20250127_181054.jpg - 864kB20250127_181240.jpg - 767kB20250127_181430.jpg - 568kB20250127_181516.jpg - 701kB
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[*] posted on 28-1-2025 at 08:18


Quote: Originally posted by Morgan  
An agate type rock of some sort I felt needed an eye. It's about 11 cm thick in spots and weighs perhaps 6 kilograms or so. Not all that colorful but some closeup regions have a few interesting patterns.


It could be an agate derived from Cacholong. It could have a partially organogenic origin from dead prehistoric animals!
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[*] posted on 28-1-2025 at 18:00


Not much zing with a black light. But wonder what formed the circle shapes, as seen on the backside of the rock in a previous post when enlarged. Not the clustered bumpy nodules but the pebble or shell-like rounded impressions. Don't know much about geology ...

20250128_192856.jpg - 392kB 20250128_192905.jpg - 378kB


[Edited on 29-1-2025 by Morgan]
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[*] posted on 28-1-2025 at 18:28


I'd name that rock Bullwinkle...
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[*] posted on 28-1-2025 at 19:15


Quote: Originally posted by Dr.Bob  
I'd name that rock Bullwinkle...

I always liked that show and wry humor. "Tell me about the rabbits George!" (Steinbeck's novel Of Mice and Men)
https://youtu.be/fUbKIQIh7G0?t=1239
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