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Chalcedony

Natural History Museum of Denmark, Mineral Hall

#chalcedon #chalcedony #minerals #geology #natural history museum #natural history #natural history museum of denmark #danish natural history museum #danish museum #danish museums #museum #museums #mineral hall

Want to do a group excercise?

I found this rock years ago in the Ambitzgi Riet which you can find on Maps at (47°18'10.5"N 8°48'23.9"E). It is a swampy area dominated by drumlins and anthropogenic interferences such as a railway line, where people go to take a walk and stuff. Back then I went to an alpine petrologist at ETH Zürich to ask their opinion on it, as I myself wasn't quite sure what to make of this rock after trying to determine it on my own. It does not react with hydrochloric acid, except for on one of the edges (you can probably already see which one). Overall it has rough edges & cuts, except for one area in which it is more eroded & smoothened. Most of it has a matte shine, except for almost all of the fillings in those round sorta dots. Some of those fillings are transparent, some aren't & just white. The dots /balls may be a filling. We didn't do a chemical analasys back then & I didn't go a second time with the same rock. Back then the answer was it's probably chalcedon and agate /achat. You can find rock like this in Germany or more likely even Mexico, thing is: Not in the swampy area I found it at and not anywhere adjacent to it. So here's the question: He was probably correct on the composition of the rock, though it may contain more stuff that went unmentioned. If we can assume all of it was correctly stated, what do you believe to be the story behind how it got to where I found it? What would you challenge or check again?

#rock #petrology #agate #achat #chalcedon #switzerland #rock determining #stone #geology #alps #riet #questions

New in my shop : 1991 Journal of Christian Reconstruction v13 #1 Symposium Christianity Business ~ Reformed theonomic movement under the ideas of Rousas Rushdoony, Greg Bahnsen and Gary North

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"Reformed theology is not only systematic but also 'catholic,' sharing much in common with other communions that are part of historic Christianity. The sixteenth-century Reformers were not interested in creating a new religion. They were interested, not in innovation, but in renovation. They were reformers, not revolutionaries. Just as the Old Testament prophets did not repudiate the original covenant God had made with Israel, seeking instead to correct the departures from revealed faith, so the Reformers called the church back to its apostolic and biblical roots.

Though the Reformers rejected church tradition as a source of divine revelation, they did not thereby despise the entire scope of Christian tradition. John Calvin and Martin Luther frequently quoted the Church Fathers, especially Augustine. They believed the church had learned much in her history, and they wished to conserve what was true in that tradition. For example, the Reformers embraced the doctrines articulated and formulated by the great ecumenical councils of church history, including the doctrines of the Trinity and of Christ's person and work formulated at the councils of Nicea in 325 and of Chalcedon in 451."

R. C. Sproul- What is Reformed Theology, published by Baker Books, P. O. Box 6287, Grand Rapids, MI., pgs. 28-29.

#r. c. sproul #reformed theology #catholic #councils #nicea #chalcedon #reformers #church fathers

Check out 1991 Journal of Christian Reconstruction v13 #1 Symposium Christianity Business ~ Reformed theonomic movement under the ideas of Rousas Rushdoony, Greg Bahnsen and Gary North

View/Buy https://www.ebay.com/itm/265244171811

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