I bought a few more Primatek (Daniel Smith) watercolor paints from Merriartist; they are having an amazing sale on watercolors this month (ask for the sale code.)  I had to play with them, of course, and think I have fallen in love with two I would not thought I  would love.  I bought them to use in buildings, for marble and brick color, but they are both versatile.    The first is Piemonite Genuine, from Piemontite, from the Prabornaz Mine, in Saint-Marcel, Aosta Valley, Italy.  Above, what it does when mixed with my traveling palette is amazing — creates rich colors with depth, and surprising effects.
It is my new favorite.  I am fickle with color.

The second color is Yavapei Genuine, from the home of Montezuma Castle Monument
and Agua Fria National Monument in Yavapei County, Arizona.  Like my other
favorite, Hematite Genuine, this burned biscuit color creates swirling earthy colors
even when combined with brights like Opera Pink and Amazonite!

Kyanite Genuine is made from the mineral by the same name, which is found in
many places and also comes in rare variations, though it is usually a blue grey.
I am not sure how often I will use this — it is quite iridescent.
One thing that may interest you, is what happens when you come back and add water drops to the Primateks.  They layers of color as the minerals separate.  Look at the Serpentine, Piemonite, and Black Tourmaline mixed with the Kyanite, above.

Amazonite Genuine does not have the same mineral quality of the other Primateks,
but behaves more like a finely ground paint.  Amazonite is a form of microcline fieldspar, found in Colorado, Virginia, and Russia.   I used it often in my jewelry line
(shameless plug), because it is the soft blue of the sky.
Below, Amazonite, Hematite, and Lapis Primateks by Daniel Smith.

Stillman & Birn Alpha journal with Platinum Preppy fountain pen,
and various Noodlers ink.  Daniel Smith Primatek and other colors,
with Holbien, QoR and Sennelier watercolors.

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Thanks to Wikipedia for info and images not mine, and to Daniel Smith for paint images.