Titanium dioxide, better known as “titanium white,” originates, oddly enough, with the black mineral ilmenite.
Named for its type locality in the Ilmen Mountains of Russia’s southern Urals, ilmenite is iron titanium oxide (FeTiO3 ). An abundant mineral that crystallizes in the trigonal system, ilmenite usually occurs in massive or granular forms and occasionally as the tabular crystals sought by mineral collectors. Black, opaque, weakly magnetic, and exhibiting a metallic-to-submetallic luster, ilmenite has a Mohs hardness of 5.5-6.0 and a substantial specific gravity of 4.7-4.8.
As one of the first minerals to crystallize from solidifying magma, ilmenite’s density enables it to concentrate in layers at the bottom of magma chambers through the process of magmatic segregation. Solidification usually produces igneous masses with ilmenite-enriched layers. Then, as the host rock eventually weathers and erodes, the freed ilmenite particles concentrate in alluvial deposits. Placer miners know that the black sands in gold-pan and sluice concen-trates often consist largely of ilmenite.
Bu hikaye Rock&Gem Magazine dergisinin January 2021 sayısından alınmıştır.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber ? Giriş Yap
Bu hikaye Rock&Gem Magazine dergisinin January 2021 sayısından alınmıştır.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber? Giriş Yap
This News is for the Birds
The amazing range of the would-be birds!
CALIFORNIA MAGNESITE PLASMA AGATE
California magnesite plasma agate is a kaleidoscope of minerals. Much like its neighbor from Clear Creek, it contains chalcedony, serpentine, jadeite and chromite.
HOW TO CREATE A CABBING MATERIAL
Even though Mother Nature creates almost unbounded types and numbers of beautiful materials for cabbing, often I struggle to find a slab that will work for the project that I want to do.
PINWHEEL - VIET GEMS 149
I am frequently asked what my favorite gemstone designs are and where to find them. After my trip to the Tucson Gem and Mineral Show, I updated my list of favorites to include gemstone designer, Phan Thanh Trung.
Copper Minerals: My Favorite
I have lived in the “Copper State” of Arizona for 65 years so it should not surprise readers that copper minerals are among my favorites to collect.
OPPENHEIMER, TRINITY SITE AND TRINITITE
The widely acclaimed, 2023 Hollywood biographical movie Oppenheimer recently won seven Academy Awards including Best Picture and Best Actor (Cillian Murphy).
Clearing ,Smudging & Setting Intentions for Stones
Why do you believe what you believe? Are your beliefs true because you choose to believe them? Whether it is religion, science or the metaphysical, your belief and faith make it real to you in mind, body and soul.
Rhode Island's Hobbit Stone Age
Rhode Island may be 22nd out of 30 states in miles of total coastline but when you compare coastline length to land acres, it ranks second only to Maryland.
Black Range Amethyst
Amethyst in Southwest New Mexico
EQUINE Bling!
How an Oklahoma Saddle Maker Uses Moissanite, Gold, Silver Turquoise tc to Adorn Saddles Jewelry