Using them as descriptors, can they be interchanged?

E.g. 親切な人 vs 親切の人

Is の only acceptable if referring to a specific new person from a certain
place that has been established earlier in the conversation?
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usage nuances particle-の adjectives particle-な
Using な and の interchangeably?
Both 新しいな車 and 新しいの車 are ungrammatical. 新しい is an い-adjective, and there is no
interceding particle when い adjectives precede a noun.

な adjectives (e.g., 静か、変) require な when they precede a noun. 静かな部屋, **not**
静か部屋.

焔 is not an adjective; it's a noun. The particle の is used between nouns, even
when a noun is being used in a descriptive sense. There's some overlap between
な adjectives and nouns in Japanese, but in this case, 焔な扉 would definitely be
incorrect. You can get a hint of how this sounds wrong by looking at how you
translated the phrase: "door of flames". "Flames" is clearly a noun in this
translation, as it is in the original. "Flames door" sounds odd to me in a
similar way to 焔な扉.

You can definitely find song titles with な adjectives in them; I just searched
my local karaoke box for songs with きれいな in the title and got plenty of
results, such as Pizzicato Five's 君みたいにきれいな女の子.

[Here's a lot more on Japanese adjectives from Tae Kim's
guide.](http://www.guidetojapanese.org/learn/grammar/adjectives)
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I think you need to review the basics of Japanese adjectives. 新しい is an
**i-adjective** , which means it requires neither な nor の. You always have to
say 新しい車. Saying 新しいの車 or 新しいな車 is just plain wrong.

For **na-adjectives** , you always have to use な to directly modify a noun
attributively. Using の instead is just plain wrong. As an exception, a few
adjectives can take both な and の almost interchangeably, for example
[あいにく](https://japanese.stackexchange.com/q/46690/5010), but the number of
such adjectives is smaller than you might think.

焔な扉 is just plain wrong because 焔 is not an adjective but a noun. の is a
particle that links two nouns similarly to English "of" as in "door of flame".
Some nouns are [often referred to as no-
adjectives](https://japanese.stackexchange.com/q/2770/5010) because they are
typically translated into English using adjectives. Anyway, you need memorize
the word class of each word, and use な or の properly.
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