Complete Information Guide to Rocks, Minerals, & Gemstones. The tetrahedrite Mineral Series. The Tetrahedrite series is composed of two member minerals: Tetrahedrite, the antimony-rich end member, and Tennantite, the arsenic-rich end member. Tetrahedrite is the more common member of this series, and is also the most common sulfosalt mineral. This page discusses Tetrahedrite; Tennantite has its own dedicated page. The most common crystal habit for Tetrahedrite is tetrahedral, which describes an unusual triangular crystal form.
What does it look like? The type of Blues Dancing that we do is centered on very strong partner connection with the basis being pulsing weight changes. The current form of Blues actually evolved out of the Swing/Jazz partner dancing scene, though original Blues Dancing is actually one of the parents to Swing and Jazz.
The most common musical form of blues is the 12-bar blues. The term 12-bar refers to the number of measures, or musical bars, used to express the theme of a typical blues song. Nearly all blues music is played to a 4/4 time signature, which means that there are four beats in every measure or bar and each quarter note is equal to one beat. A 12-bar blues is divided into three four-bar segments. A standard blues progression, or sequence of notes, typically features three chords based on the first (written as I), fourth (IV), and fifth (V) notes of an eight-note scale.