Ball Cactus

Ball Cactus

This image comes from the succulent room at Kingwood Center in January of 2008.

Personally, I probably would not have a cactus growing in my house but I have known people who did.  I thought this interesting.

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Plattnerite

Plattnerite

I have two samples of the this lead oxide mineral.  (I)t occurs in weathered hydrothermal base-metal deposits as hay-like bundles of dark prismatic crystals with a length of a few millimeters; the bundles grow on, or sometimes within various minerals,  Wikipedia.

I am learning to photograph macro minerals and this is taking a lot of time. I have built light setups, bought a used camera and done a lot of reading in the process.

Plattnerite

Both of my samples are from Milford Mine Goodsprings Clark Co. Nevada.

Plattnerite

I think it is time to move on to another sample as I have worked on these for three weeks.

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Cactus

Cactus:  Kingwood Center 1/14/19

Not an exactly "friendly" plant, this cactus was taller than I.  It seems to be in repose in this image.

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Petrified Wood

Petrified Wood

It looks so much like wood it is hard to believe that it is stone.

Petrified Wood

It is the result of a tree or tree-like plants having completely transitioned to stone by the process of permineralization. All the organic materials have been replaced with minerals (mostly a silicate, such as quartz), while retaining the original structure of the stem tissue. Unlike other types of fossils which are typically impressions or compressions, petrified wood is a three-dimensional representation of the original organic material. The petrifaction process occurs underground, when wood becomes buried under sediment or volcanic ash and is initially preserved due to a lack of oxygen which inhibits aerobic decomposition. Mineral-laden water flowing through the covering material deposits minerals in the plant's cells; as the plant's lignin and cellulose decay, a stone mold forms in its place. The organic matter needs to become petrified before it decomposes completely.^[1] A forest where such material has petrified becomes known as a petrified forest.  Wikipedia

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