Sometimes, "granite" isn't granite at all

This is Absolute Black. It is always labeled and sold as granite but it isn't granite. It's a mineral called gabbro.

When magma gets trapped in a single layer underneath the earth's crust, it will gradually cool and form gabbro. Now if the same material were to be pushed up from below under great pressure, it would form granite. But then again, if that magma were to come in contact with water it would turn instantly into basalt. Are you still following me here? Gabbro, granite and basalt are essentially the same material in different forms. In order to form granite, magma needs a good hard squeeze so its component materials can separate and form large crystals. If magma cools very quickly upon contact with air or water, it will form basalt. And if magma is left alone for a couple million years it will form gabbro.

Why is this important? Well, it's important because those three phases of former magma have different properties. Basalt is the most brittle of the three which is why it doesn't get used as counter top material. Most granites are strong enough to be sliced into 3cm sheets without too much trouble. But gabbro, due to its uniform crystal size and density is stronger than granite. This means that it can handle longer, unsupported overhangs --like on a bar. It can be carved into more ornate edge treatments and since it's so uniform, it is more water resistant. Absolute black is a great stone to make into a sink, whereas you wouldn't want to use most granites for that purpose.

The downside to it (if it's truly a downside) is that it's always black or very nearly black. Chances are good that if you're looking at a uniformly black or very dark grey granite, you're not looking at a piece of granite at all, but rather a piece of gabbro.

Now, due to that uniform crystal size and density, gabbro can be shined up to a mirror-like surface and that's where the problem with it is as it's ordinarily used comes in. It is impossible to keep clean if it's being used as a kitchen counter when it has that mirror finish. I have never heard of someone who had it and liked it. But the problem isn't the material, it's the finish. It will show every finger print, water spot, smear and smudge. It would drive me insane.

Here's a slab of absolute black with a honed finish. The honed finish tones down the black quite a bit, and in so doing, it eliminates the mirror effect.

Here's a whole kitchen done in honed Absolute Black. It's a much calmer counter than the shot at the top of this post, wouldn't you say?

Now, because true Absolute Black "Granite" is a premium, a lot of less-than-honorable stone suppliers will take a less-expensive predominantly black granite and call it Absolute Black because most people can't tell the difference.

Sometimes; similar, dishonorable suppliers will actually dye inexpensive granite with black pigments and sell it as more expensive Absolute Black.

Not that I'd know any of these less-than-honorable business people personally...

Anyhow, if you're in the market for absolute black, make sure that what you're buying is just that. If it looks like this, it ain't absolute black.

And as a completely unrelated yet completely cool side note, the paving stones on the streets of Pompeii are gabbro.

Sometimes I just love geology. Even if the only person I fascinate with this stuff is me.

And another thing about soapstone...

After I finished that last bit about soapstone, I picked up my current copy of K+BB, a kitchen and bath trade publication. The cover photo this month is of an uber modern kitchen renovation in Hawaii that features soapstone counters. Here are some shots of it, please pardon their lousy
resolution and small size.

I really like this kitchen and the more I read about it the more I liked it. The designers behind it used a line of German cabinetry called Studio Becker. Studio Becker is about as good as it gets as far as I'm concerned. They are exquisitely made and their finishes have to be seen to be believed. They will also set you back farther than any other line of cabinetry I can think of. If people have an awareness of a high-end European cabinet the name they think of is Poggenpohl. Studio Becker makes Poggenpohl look like junk from Ikea. I kid you not. I go on regular pilgrimages to the McKB (that's the Manhattan Center for Kitchen and Bath if you're not in the know) specifically to run my unworthy fingers over their Studio Becker displays.

So this tells me that the kitchen I'm showing you here set these owners back in excess of $100,000, probably well in excess of $100K. That's all well and good too, if you want to spend that kind of money on your house than God love you for it. Please make sure you call me first. Hah! Anyhow, this design ended up with its own name. I don't know if it came from the homeowners or from the designers, but this design has been dubbed "Zen."

Now correct me if I'm wrong, but Zen is a school of Buddhism whose adherents turn inward in a search for inner peace and wisdom. The practice of Zen encourages people to turn their backs to the trappings of the world and instead concentrate on more weighty, non-temporal matters.

Now I ask you, how is spending more than $100K on a kitchen renovation in any way Zen? Man that drives me nuts.

So my rantings aside, soapstone can be used to terrific effect in a modern setting, even if it's unpardonably labeled "Zen."

Please pass the soapstone

Another metamorphic rock that makes its way into homes is steatite, commonly called soapstone. It's composed primarily of the mineral talc with a healthy does of magnesium for good measure. The magnesium is where it gets its grey color. Soapstone formation occurs in regions of tectonic subduction and in the presence of water. Let me whip out my rock phase illustration again.

By the time a slab of soapstone ends up in some one's home, it's between 400 and 500 million years old to give you some sense of the timeline involved in its formation.

Soapstone is soft. You can write your name in it with a fingernail is how soft. Due to its high talc content, it feels somewhat like a bar of soap to the touch, hence its name.

Even though it's very soft, it's an excellent material for kitchen and bath counters. Unlike a lot of stone, soapstone is neither alkaline nor acidic and is completely inert. That means that virtually nothing can make it react chemically. Vinegar and lemon juice, the great etchers of marble, have no effect on soapstone. It's virtually non-porous, so oils and dark-colored liquids can't stain it.

The stuff's used for table tops in chem labs for a reason.

Most people oil their soapstone with mineral oil but this doesn't do anything but enhance its color and minimize the appearance of the hairline scratches it will accumulate over time. In its un-oiled state, soapstone is grey. Add mineral oil and it turns black. With repeated applications, this oil-induced black color will become permanent, but that's due to the oil oxidizing on the surface of the stone.

Soapstone's an excellent heat diffuser and that's why it gets used to make fireboxes and wood stoves. It's also water proof and that's why it gets used to make sinks and cookware.

Soapstone is a great material to use in a kitchen. Its grey-black color is an achromatic neutral and that means it will go with anything. If you're considering a kitchen renovation and you want to try something different but still a natural stone, think about soapstone.

Onyx is not what you think

The polished rock pictured above is true onyx. Onyx is a form of quartz called chalcedony (what a great word) that's usually associated with volcanic activity. As a form of quartz, chalcedony is composed of silica. It's formed when water dissolves silica to the point of saturation. What precipitates out of the saturated solution is chalcedony. Chalcedony, or true onyx, is a semi-precious stone that's used primarily to make jewelry.


The materials I'm showing above are sold as onyx, but they are an unrelated stone. Repeat, they aren't really onyx. That certainly doesn't distract from their beauty, but knowing what things are is important.

The stones shown above are a form of calcite called sinter. If you go to a stone yard and ask to see a slab of sinter they will look at you like you have three heads, so play along and call it onyx. Sometimes, knowing something and keeping it to yourself can be really satisfying.

Sinter, or commercial onyx is formed from calcite in a way similar to how travertine is formed. Water dissolves calcite from limestone to the point of saturation and what precipitates out of that solution will form either sinter or travertine depending on a couple of factors. If there are air bubbles present at the time that the calcite gets deposited then the resulting stone will be travertine. If there are no air bubbles, then the resulting stone will be sinter, or commercial onyx.

If you've ever been in a cave, the stalactites and stalagmites are made from calcite and if left to form large enough deposits, they may end up as a vanity counter several thousand years in the future.

What this means too is that this material is a sedimentary rock. Of the three types of rock (igneous, metamorphic and sedimentary), sedimentaries are almost always the most fragile and commercial onyx is no exception. It can't handle everyday stresses and it is very easy to chip and crack. People who don't know any better sell this stuff as real, silicaceous onyx. If it were silica-based, it would wear a lot better than this material actually does. Keep in mind that it is as high maintenance as travertine. I think travertine's gorgeous, it's my favorite flooring material. But I wouldn't put it on a counter if you put a gun to my head.

It can't handle heavy traffic or exposure to acids. It's extremely porous and makes a pretty lousy kitchen surface. Besides, most of it is supremely busy and a little of it goes a long way. In the bathroom pictured above, it looks interesting without being overwhelming. But just barely.

In the kitchen above it looks like the scene of a grisly murder or a slaughterhouse. Seriously, it looks like these people have a meat back splash. Ugh. This material is very expensive and as the kitchen above illustrates beautifully, expensive doesn't always mean tasteful.

The less garish form shown on the tub surround above is usually called honey onyx. I've used the same material as a desk top in an office and it looked interesting without being too too. Get up close and personal to a slab of the material pictured above some time if you get the chance. It's really interesting. It looks like half crystallized caramel. It's a little too wild for my tastes, but I can't walk past it without stopping. Sometimes, stuff that comes out of the ground is just jaw dropping.

The Bailout explained

Paddy Hirsch, senior editor of NPR's Marketplace, released another video that explains the bailout in easy to follow terms. He explains what's happening in the financial markets, what the Fed and the Treasury's plan is to fix it and what's at stake. Brilliant!

The credit crisis as Antarctic expedition from Marketplace on Vimeo.