Complete Information Guide to Rocks, Minerals, & Gemstones
Minerals & Varieties
View All Minerals
View by Alphabetical Order
Varieties and Other Names
Filter by Chemical Group
Filter by Color
Filter by Streak
Filter by Hardness
Filter by Crystal Group
Most Visited Minerals
View All Gemstones
This Month's Birthstone
Gemstones By Color
Most Visited Gemstones
What is a Rock & What is a Mineral
Chemical Properties of Minerals
Top 5 Tips for Diamond Buying
All Research Topics
View Posted Questions
Ask A Question
Most Popular Questions
Twitter News Feed
Follow us on Pinterest
Mineral Photo Gallery
Gemstone Photo Gallery
View All Videos
View Minerals.net Videos
View Our YouTube Channel
Add Your Free Listing
Online Reference Sites
The Mineral and Gemstone Kingdom: Image Photo Gallery
Mineral Images A-Z
Acanthite is composed mostly of the precious metal silver, and is its most important ...
Acanthite is composed mostly of the precious metal silver, and is its most important
. Acanthite and
are usually grouped together in mineral guides as one mineral. However, they are scientifically recognized as two unique minerals, even though they are composed of the same substance. They only differ in
. As explained below in more detail, Argentite cannot exist at normal temperatures. Specimens labeled as Argentite are sometimes sold by dealers, however, these specimens are really Acanthite
s after Argentite.
Acanthite is named for the Greek term
, which means "thorn", in allusion to it pointy crystal forms. Argentite is named for
, which is the Latin word used for silver.
Actinolite and Tremolite are two very similar minerals that form a series with each o...
are two very similar minerals that form a
with each other and essentially share the same
. Actinolite has a greater presence of iron over magnesium, whereas Tremolite has a greater presence of magnesium over iron.
The green color of Actinolite is produced by the iron in its
. The amount of iron varies among specimens, causing different contrasts of green. More iron will give a specimen a darker color.
Actinolite sometimes occurs as thin, splintery
crystals. If the inclusions are parallel and dense, it will cause
in the Quartz.
Actinolite and Tremolite share several recognized varieties.
, a thickly
and leathery variety, has a
, a soft felt-like feel, and
, another fibrous variety, is made up of tough, interlocking fibers, so dense that the fibers are not discernible. Translucent Nephrite with a uniform or interesting color distribution that is extremely tough fits under the category of