metamorphic
Quartzite with Iron Inclusions
Quartzite (pre d om i n a n t l y SiO2) with H e m a t i t e / G o e t h i t e
Hardness: 7 (Mohs scale); C o l o r : T a n , y e l l o w-b r o w n w i t h d a r k g r a y/b l a c k s t r e a k s; L u s t e r : V i t r e o u s t o g r e a s y; C r y s t a l S t r u c t u r e : T r i g o n a l (m i c r o c r y s t a l l i n e); C l e a v a g e : N o n e; S p e c i f i c G r a v i t y : 2 . 6-2 . 7
- Hardness
- 7 (Mohs scale)
Identified More metamorphic →
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Physical properties
Hardness: 7 (Mohs scale); C o l o r : T a n , y e l l o w-b r o w n w i t h d a r k g r a y/b l a c k s t r e a k s; L u s t e r : V i t r e o u s t o g r e a s y; C r y s t a l S t r u c t u r e : T r i g o n a l (m i c r o c r y s t a l l i n e); C l e a v a g e : N o n e; S p e c i f i c G r a v i t y : 2 . 6-2 . 7
Formation & geological history
For m e d f r o m t h e m e t a m o r p h i s m o f q u a r t z s a n d s t o n e u n d e r i n t e n s e h e a t a n d p r e s s u r e , o f t e n r e s u l t i n g i n t h e r e c r y s t a l l i z a t i o n o f q u a r t z g r a i n s . T h e d a r k v e i n s i n d i c a t e i r o n o x i d e s e e p a g e d u r i n g o r a f t e r f o r m a t i o n .
Uses & applications
Used i n c o n s t r u c t i o n a s r o a d b a l l a s t , a s a r a w m a t e r i a l f o r g l a s s m a k i n g ( i f p u r e ) , a n d o c c a s i o n a l l y a s d e c o r a t i v e l a n d s c a p i n g s t o n e .
Geological facts
Quartz i t e i s s o h a r d t h a t i t w i l l b r e a k t h r o u g h t h e s a n d g r a i n s r a t h e r t h a n a r o u n d t h e m , u n l i k e i t s p a r e n t r o c k , s a n d s t o n e . I t i s v e r y r e s i s t a n t t o c h e m i c a l w e a t h e r i n g .
Field identification & locations
Ide n t i f i a b l e b y i t s a b i l i t y t o s c r a t c h g l a s s a n d i t s s u g a r y t e x t u r e o n f r e s h b r e a k s . C o m m o n l y f o u n d i n m o u n t a i n o u s r e g i o n s a n d r i v e r b e d s w h e r e r e s i s t a n t m a t e r i a l s a c c u m u l a t e .
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