CALCITEBRITTANI WANG

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mineral

Ca lc i te i s a magic minera l , i s has an opt ica l property ca l led b i re f r ingence, wh ich means double re f ract ion .

BIREFRINGENCE2

mineral

I t cou ld be co lor less , wh i te , grey , ye l low, green, red , brown or even b lack for i t s impur i t ies . I t a l so cou ld fl uoresced red, b lue , ye l low and other co lors under e i ther SW and LW UV.

COLORFUL3

mineral

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MINERAL PROPERT IES

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Category: Carbonate mineral Luster: vitreous to pearly

Formula: CaCO3 Steak: white.

Crystal habit: crystalline, granular, stalactites, concretionary, massive,

Diaphaneity: Transparent to translucent

Cleavage: Perfect on three directions Specific gravity: 2.71Fracture: Conchoidal Optical properties: UniaxialTenacity: brittle Solubility: Soluble in dilute acidsMohs scale hardness:3 Crystal system: Trigonal hexagonal

scalenohedral

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mineral

C R Y S T A L S Y S T E M

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• C a l c i t e f o rm s a p re c u r s o r ( a m o r p h o u s c a l c i u m c a r b o n a t e )

• Tw o w a y s :1. AC C n a n o p a r t i c l e s r a p i d l y d e h y d r a t e a n d

c r y s t a l l i z e t o f o rm i n d i v i d u a l s p a r t i c l e s o f v a t e r i t e

2. T h e v a t e r i t e t r a n s f o rm s t o c a l c i t e v i a a d i s s o l u t i o n a n d re p re c i p i t a t i o n m e c h a n i s m w i t h t h e re a c t i o n r a t e c o n t ro l l e d b y t h e s u r f a c e a re a o f c a l c i t e .

F O R M AT I O N P R O C E S S E S

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mineral

• Calc i te i s a carbonate minera l and the most s tab le po lymorph o f ca lc ium carbonate (CaCO3).

• Calcite has a defi ning Mohs hardness of 3.

WE NEED TO KNOW

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mineral

• Ca lc i te ’ s lus ter i s v i t reous and pear ly on c leavage sur faces .

• Cleavage i s a lways in th ree d i rec t ions para l le l to the rhombohedron fo rm

• Ca lc i te ’ s f rac ture i s concho ida l but i t s ra re ex i s t natura l l y.

WE NEED TO KNOW

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mineral

• Calc i te don’ t have magnet ism and no eff ervescence .

• The s t reak o f ca lc i te i s wh i te• Calc i te i s t ransparent ( I ce land spar )

to opaque and may show phosphorescence

WE NEED TO KNOW

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mineral

• C a l c i t e i s a c a r b o n a t e m i n e r a l , i t c a n d i s s o l v e w i t h m o s t f o rm s o f a c i d . Te m p e r a t u re , P H a n d i o n c o n c e n t r a t i o n s i n t h e w a t e r c a n e ff e c t i t s r a t e o f d i s s o l v e .

• C a l c i t e a l s o h a s a u n u s u a l c h a r a c t e r i s t i c , r e t ro g r a d e s o l u b i l i t y w h i c h c a n g a t h e r ro c k s t o g e t h e r t o fi l l t h e f r a c t u re s .

WE NEED TO KNOW

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COMMON USES OF THE MINERAL

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mineral

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• I t was used in Wor ld War 2 for gun s ights , spec ifi ca l ly in bomb s ights and ant i -a i rc ra ft weaponry

HIGH-GRADE

OPTICAL

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mineral

将图片拖动到占位符，或单击添加图标 Microb io log ica l ly prec ip i ta ted ca lc i te has a w ide range of app l icat ions , such as so i l remediat ion , so i l s tab i l i zat ion and concrete repa i r

N AT U RA L O C C U R R E N C E

mineral

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Ca lc i te i s a common const i tuent o f sed imentary rocks . I t ’ s fo rmed f rom the she l l s o f dead mar ine organ isms.

LIMESTONE

• Bibl iography: h t t p: / / p h o t o . b a i k e . c o m /

p h o t o _ 1 0 0 0 0 2 0 1 0 1 0 2 3 0 0 4 6 1 4 8 3

• h t t p : / / b b s . g e o n e t . c n / t h r e a d - 4 8 5 5 3 - 1 - 1 . h t m l

• h t t p : / / w w w. n u m a c . c o m . a u / e n v i r o n m e n t a l -

s e r v i c e s . h t m l

• h t t p : / / w w w. m i n s o c a m . o r g / a m m i n / A M 6 6 / A M 6 6 _ 8 85 . p d f

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• Thanks for watching

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mineral