NMR properties:

Magnetogyric Ratio NMR frequency Natural abundance (NA) Nuclear spin (I) Quadrupole moment (Q) Reference sample
12 C
13 C
12 C
6

(Latin: carbo, charcoal) Carbon, an element of prehistoric discovery, is very widely distributed in nature.
It is found in abundance in the sun, stars, comets, and atmospheres of most planets. Carbon in the form of
microscopic diamonds is found in some meteorites.
Natural diamonds are found in kimberlite of ancient volcanic "pipes," found in South Africa, Arkansas,
and elsewhere. Diamonds are now also being recovered from the ocean floor off the Cape of Good Hope.
About 30% of all industrial diamonds used in the U.S. are now made synthetically.
The energy of the sun and stars can be attributed at least in part to the well-known carbon-nitrogen cycle.
Forms
Carbon is found free in nature in three allotropic forms: amorphous, graphite, and diamond. A fourth
form, known as "white" carbon, is now thought to exist. Ceraphite is one of the softest known materials
while diamond is one of the hardest.