by Ann » Sun Sep 18, 2022 4:12 am
MarkBour wrote: ↑Sat Sep 17, 2022 10:37 pm
Sa Ji Tario wrote: ↑Sat Sep 17, 2022 3:12 pm
What would that inverted "U" piece be on top of another opposite "U" in the lower left quadrant? Are they loose parts of the probe? (In color blue)
This? It looks like an unusual rock, to me. But maybe worth a closer look. I wonder what color it "really" is.
Good question. I think it is dark and non-red. Not blue. Blue rocks are exceedingly rare. On Earth, there exists a blue rock named lapis lazuli, which is found in small quantities in some excavations in Afghanistan.
UdaipurTimes wrote:
The discovery of Lapis Lazuli, a semi precious stone at the archaeological site at Chandrawati in Sirohi district recently, indicates trade relations between the Parmar dynasty and Afghanistan, way back in the Harappan times...
“Lapis is a semi-precious stone prized since antiquity for its intense blue color. It has been mined in the Badakhshan province of Afghanistan for 6,500 years. The trade in the stone is ancient enough for lapis jewelry to have been found at pre-dynastic Egyptian sites, and lapis beads at Neolithic burials in Mehrgarh, the Caucasus, and even as far from Afghanistan as Mauritania,” said project director Prof JS Kharakwal of JRN Rajasthan Vidyapeeth.
We have no reason to think that any rocks found on the Martian surface are made of lapis lazuli. Therefore, the bluish-looking Martian rock in the APOD is not blue, but dark and non-red. The reason it looks blue is that the ground that it rests on is so reddish.
How about the rock in question is made of
basalt? That's an igneous rock that is fits the requested "color bill". It's common enough, too.
Note that the bedrock seen in the APOD is red, but the fine-grained regolith (sand) on top of it is dark and non-red. I think that a high proportion of basalt grains could be mixed into the regolith to make it dark.
Ann
[quote=MarkBour post_id=325893 time=1663454268 user_id=141361]
[quote="Sa Ji Tario" post_id=325887 time=1663427543]
What would that inverted "U" piece be on top of another opposite "U" in the lower left quadrant? Are they loose parts of the probe? (In color blue)
[/quote]
[img2]https://asterisk.apod.com/download/file.php?id=45721[/img2]
This? It looks like an unusual rock, to me. But maybe worth a closer look. I wonder what color it "really" is.
[/quote]
Good question. I think it is dark and non-red. Not blue. Blue rocks are exceedingly rare. On Earth, there exists a blue rock named lapis lazuli, which is found in small quantities in some excavations in Afghanistan.
[float=right][img3=""]https://udaipurtimes.com/static/c1e/client/74416/migrated/dea790a47049a5a15ce5f01fbf1c5f4c.jpg[/img3][/float][quote][url=https://udaipurtimes.com/education/chandrawati-excavation-leads-to-discovery-of-lapis-lazuli/c74416-w2859-cid106645-s10703.htm]UdaipurTimes[/url] wrote:
The discovery of Lapis Lazuli, a semi precious stone at the archaeological site at Chandrawati in Sirohi district recently, indicates trade relations between the Parmar dynasty and Afghanistan, way back in the Harappan times...
“Lapis is a semi-precious stone prized since antiquity for its intense blue color. It has been mined in the Badakhshan province of Afghanistan for 6,500 years. The trade in the stone is ancient enough for lapis jewelry to have been found at pre-dynastic Egyptian sites, and lapis beads at Neolithic burials in Mehrgarh, the Caucasus, and even as far from Afghanistan as Mauritania,” said project director Prof JS Kharakwal of JRN Rajasthan Vidyapeeth.[/quote]
We have no reason to think that any rocks found on the Martian surface are made of lapis lazuli. Therefore, the bluish-looking Martian rock in the APOD is not blue, but dark and non-red. The reason it looks blue is that the ground that it rests on is so reddish.
How about the rock in question is made of [url=https://en.wikipedia.org/wiki/Basalt]basalt[/url]? That's an igneous rock that is fits the requested "color bill". It's common enough, too.
Note that the bedrock seen in the APOD is red, but the fine-grained regolith (sand) on top of it is dark and non-red. I think that a high proportion of basalt grains could be mixed into the regolith to make it dark.
Ann