17 Questions 98 Answers 0 Followers
Questions related from Ioannis Kamvisis
DEAR COLLEAGUES GREETINGS. IN A RECENT WALK IN BAHNSTADT NEAR HEIDELBERG (GERMANY), I FOUND A PIECE OF GRAVEL WHICH WAS USED IN A CONSTRUCTION SITE. IT IS A MAFIC VOLCANIC PROBABLY FROM AN...
29 May 2025 6,161 8 View
DEAR COLLEAGUES GOOD MORNING TO YOU ALL. I HAVE RECENTLY FOUND A 2MM CRYSTAL IN ALLUVIUM IN AN AREA THAT DIAMONDS HAVE BEEN MENTIONED TO OCCUR. I CHECKED IT UNDER A DIGITAL STEREOSCOPIC...
19 December 2024 3,789 21 View
Dear colleagues Good morning. Diamonds have been known from various locations around the world, some of which are unconventional (far away from cratons). The Roman writer Pliny the Elder mentioned...
07 October 2024 3,205 4 View
Dear colleagues Good morning. Diamonds have been found in several geotectonically unconventional occurrences from around the world like Borneo, the Urals, NSW, California, Burma, Thailand,...
02 October 2024 8,016 7 View
Dear colleagues Good morning. The IUGS TGIR (Task Group on Igneous Rocks) is planning to publish a book (glossary) on the classification of igneous rocks in 2025. Should the IUGS TGIR adopt the...
09 September 2024 5,765 2 View
Dear colleagues Good morning. I have noticed that in the few recent years extreme natural phenomena are more frequent than before (see file attached). Is this assumption correct? Please comment...
15 January 2024 557 9 View
Dear colleagues Good day to you all. One of the most famous debates in Igneous Petrology is the relation between the diamondiferous rocks (i.e. lamprophyres, lamproites, orangeites and...
06 November 2023 871 0 View
12 September 2023 1,785 4 View
Dear colleagues Good day to you all. The old conventional depth of 150km for the diamond stability field has several times been updated to lower values (in particular to 75, 80, 100, 110, 120, 135...
20 June 2023 7,337 2 View
Dear colleagues Good morning. I have found a rock speciment (first photo) within a crater in the Pindus mountains of Greece. Is it a volcanic carbonatite? A photomicrograph of a known carbonatite...
28 April 2023 3,833 12 View
Dear colleagues Good morning. I recently visited a crater and collected a couple of samples from the ring. Could these be geyserites or something else? Best regards Ioannis
16 March 2023 3,025 8 View
DEAR COLLEAGUES I RECENTLY VISITED THE HILL OF THORIKON NEAR LAURION. IT HAS AN IGNEOUS FORMATION ON THE TOP. OLD MAPS CALL IT AN OPHIOLITE. I SEND THREE PHOTOS. WHAT KIND OF ROCK DO YOU THINK IT...
07 March 2023 1,197 6 View
Dear colleagues I was wondering, are there any kimberlite occurrences in Europe (outside of the East European Craton i.e. Baltic and Ukrainian shields)? Could the lack of information on this area...
19 February 2023 3,269 8 View
Dear colleagues I am stydying two circular ponds with a ring (see attached photos). I cannot figure out if they are impact craters or maars. Could anyone help? Best regards Ioannis
03 March 2022 9,936 16 View
Off-craton kimberlitic rocks are known from different geotectonic environments from around the world. In particular, they are found far away from cratons in the Appalachians, Bolivia, Cape Fold...
12 November 2021 5,103 2 View
Diamond exploration uses certain kimberlitic indicator minerals like G10 garnet (pyrope), magnesiochromite, picroilmenite, Cr-diopside, forsteritic olivine and zircon. Are there any other...
20 October 2021 8,951 17 View
01 January 1970 3,160 2 View
