Ignis mods contest thread 10/13-10/21

[Orobas]

Great post on fossilpoop

Today's rock is Staurolite, which is interestinting looking:

A special property of staurolite is that it often occurs twinned in a characteristic cross-shape, called penetration twinning. In handsamples, macroscopically visible staurolite crystals are of prismatic shape. They are often larger than the surrounding minerals and are then called porphyroblasts.

In thin sections staurolite is commonly twinned and shows lower first order birefringence similar to quartz, with the twinning displaying optical continuity. It can be identified in metamorphic rocks by its swiss cheese appearance (with poikilitic quartz) and often mantled porphyroblastic character.

Staurolite - Wikipedia, the free encyclopedia

 

[Col. Gaunt]

Favorite stone for Thursday is Lapis Lazuli


Favorite stoner for Thursday is

 

[NancyR]

and whod of thunk it Jade

 

[HooP OoteD?]

Benitoite

 

[CalamityJan]

Natural Drusy Quartz

 

[tmcase]

Malicite


Click to enlarge.​

 

[whodat2112]

Thursday is Black Onyx

 

[loxmythe]

Amethyst like my (now) wife's engagement ring:

 

[Foggy]

Thursday!

Animals turned to stone:

The Mammoth Site, Hot Springs, South Dakota

 

[izdalion]

I love jade for some odd reason

 

[Reddhott]

black jade

 

[BluSwatch]

Thursday's entry .... gotta love the green.

Pyromorphite

 

[mogium]

Its called larimar looks very cool

 

[Pharaoh]

Amber

 

[kritter]

Citrine yellow quartz

 

[36tinybells]

Moonstone.

 

[redheadone]

Spessartite garnet

 

[Elantis]

Harlequin Opal

 

[priorities]

Oct 18th thank you for the contest and have a great night all!!

hot pink tourmaline ~ so pretty!!

 

[ManuDawg]

Friday Entry

Opal again