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419 – Graphite (Mineral),
Luster: Metallic,
Hardness: 1,
Breakage: 1 cleavage plane (hard to see),
Description: Feels soapy/slippery, makes flakes, very soft and can be scratched with your fingernail, can write easily on paper, shiny like a metal (though pure carbon), commonly silver/dark gray
Nelsonite from the Precambrian of Wyoming, USA. (~2.0 centimeters across)
Nelsonites are scarce intrusive igneous rocks. They are also known as FTP rocks, in reference to their composition: iron-rich (Fe), titanium-rich (Ti), and phosphorus-rich (P). Nelsonites are principally composed of dark gray to blackish, metallic-lustered magnetite (Fe3O4) and ilmenite (FeTiO3) (or ilmenomagnetite; titanian magnetite), plus apatite (CaPO4). Minor minerals reported in nelsonites include spinel, olivine, pyrrhotite, and graphite.
These rocks typically occur as Fe-Ti-oxide concentrations in anorthosite complexes. They appear to form as cumulates in cooling batholiths. The sample shown here is from a dike-like intrusive body, apparently formed by remobilized Fe-Ti-oxide cumulates.
Geologic Unit & Age: Laramie Anorthosite Complex (probably the Sybille Fe-Ti Oxide Deposit; Sybille Oxide Deposit), early Mesoproterozoic, 1.43 Ga
Locality: Laramie Range (probably from the Sybille Pit), southeastern Wyoming, USA
Pilot Neox Graphite leads 0.3, 0.4, 0.5, 0.7 and 0.9 mm
I believe now the set is complete. I just fell in love with this lead cases, and the leads are great
Faber-Castell 9000 pencils on drafting film 2.5"x3.5. My first finished graphite drawing in 8 years!😳
Graphite and watercolor in Moleskine on location at the Brooklyn Botanic Garden. I met up with the NY urban sketchers to see the famous cherry blossoms. Although the festival and peak is next weekend, it would have been impossible to move or see anything. As it was, the throngs of tourists were wall to wall. While we were sketching, there must have been a thousand people walking by, commenting on our sketches, and even taking pictures of us and our artwork! We were also joined by two very gifted sketchers from Oregon... neither of which knew each other. After lunch , we went next door to the Brooklyn Museum to see some extrodinary exhibits: John Singer Sargent watercolors, the museums collection of drawings and sketchbooks from mid 1700's to mid 1900's ( including Sargent and Homer), and the most amazing sculptures of Anatsui. It was a long and very inspiring day.