Nó de Pinho
 The "Nó de Pinho" ( Brazilian  for "Araucaria-Pinetree-Knots" )  is used so far, almost exclusively in Brazil, as the best natural firewood available. It is nowadays sold in  10 Kg  or 15 kg bags. 
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These "knots", heavy pieces of 'conic-shaped' wood, which during many centuries resisted  to decay under the soil, long after the trunks they were originated from had been naturally decomposed.  These 'resin-impregnated'-KNOTS (the intersection of the big branches to their trunks) remained unchanged in the soil and actually can only be desintegrated by fire. Their average size is 30 cm long by 15 cm diameter.
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While burning in a fireplace the flame lasts for several hours.  A wise user,  mixes them up with mature Eucalyptus firewood in order to provide intense heating, and saving the precious knots.
.We may antecipate that in a decade or so the "Nó de Pinho" will not be available anymore. The ones presently used are remnants of the trees which existed many hundreds of years ago.

Origin: For hundreds of years, those huge Araucaria-trunks kept falling to the ground due to "aging" (the end of their life cycle),  being  struck by lightning, fires  etc. 
 Nowadays, while plowing their land, farmers collect the knots found, pile them up for providing an "additional income", to sell them as fire-wood. 

Every year they become more scarce. The Brazilian South East  was for thousands of years covered by the so called  "Atlantic Forest" ( Brazilian designation for Native forests along the Atlantic ).  Particularly in the brazilian Southern States: Paraná, Santa Catarina and Rio Grande do Sul, Sao Paulo and Minas Gerais, the dominant species was the  ARAUCARIA, also designated "Pinheiro do Paraná"  - araucaria angustifolia and araucaria brasiliensis. 

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These trees reach up to 52 meters height and their trunk up to 8,5 meters circumference. Their cones are shaped like a ball with over 30 cm diameter and provide seeds averaging  6 cm length. (These are edible by animals,  also for humans, who boil them adding some butter and salt ).
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The lumber industry (thousands of saw-mills) exploited these Araucaria forests almost to exhaustion, mainly for export.  That "boom" which provided many thousands of jobs lasted only until mid last century.( 1950's)
Brazilian authorities nowadays  protect the natural forests and particularly the remnants of Araucaria forests. These days, the cutting of any Araucaria, as well as any native tree, requires a special permit from the local environment department.
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