with Phantom growth from the
Erongo Mountains, Namibia|
Nambibia, at the south west end of the African continent, is well known for its richness in minerals. Certainly, Tsumeb is the most famous location there. However, the Erongo Mountains near the Brandtberg-complex, produce excellent specimens, such as this wonderful Amthyst. It shows lighter and darker zones, which display "crystals in the crystal". This phenomeneon is called phantom crystal.
|An impressive crystal of
(~ 2 pounds heavy), which has a fibrous termination. |
I was told that often in such fibrous terminations Schorl changes into Foitit, another variety of tourmaline
|Amethyst from the Erongo Mountains, Namibia. These crystals show pronounced phantom growth with alternating Amethyst and Smokey quartz colors. Moreover, many of the Eronog specimen also show so-called "negative crystals", which is a cavity inside the crystal with the exact shape and faces of a quartz crystal. Frequently cavities inside the crystals are filles with liquids and gas (so-called bubbles that move when the crystal is turned). These fluids and gases can be analyzed in terms of growth conditions and origin.|
Garnet (~1 cm in diameter)|
from Marienfluss, Namibia
Spessartines from the Marienfluss are very similar in colour to those from California and China.